A Boston accent is a local accent of Eastern New England English native specifically to the city of Boston and its suburbs. Northeastern New England English is classified as traditionally including New Hampshire, Maine, and all of eastern Massachusetts, though some uniquely local vocabulary appears only around Boston. Some traditional Boston accent characteristics may be retreating, particularly among younger residents, but linguist William Labov claims that, in the twenty-first century, the accent remains relatively stable, though subsequent research suggests it is increasingly becoming limited to the historically Irish-American neighborhood of South Boston.
|Diphthongs||a? a? ( o?)|
Boston accents typically have the cot-caught merger. This means that instead of merging the historical "short o" sound (as in lot) with the "broad a" (as in father) like most other American accents, the Boston accent merges it with the "aw" sound as in "paw". Thus, lot, paw, caught, cot, law, wand, rock, talk, doll, wall, etc. all are pronounced with the same open back (often) rounded vowel /?/, which contrasts with the /a/ of father and spa. So while the word dark has no /r/ in many Boston accents, it remains distinct from dock because it belongs to the START-PALM class of words versus the LOT-THOUGHT-NORTH one: dark /dak/ vs. dock /d?k/.[page needed] While New York accents have /?/ for paw and /?/ for lot and Standard British accents have a similar distinction (/?:/ versus /?/), Boston accents only have one merged phoneme here for both: /?/.
In general, Eastern New England accents have a "short a" vowel /æ/, as in cat and rat, that is extremely tensed towards [e?] when it precedes a nasal consonant; thus, man is [me?n] and planet is [p?le?n]. Boston shares this system with some of the American Midwest and most of the West, though the raising in Boston tends to be more extreme. This type of /æ/-raising system is not shared with British or New York City accents. In addition to raising before nasals, Bostonians (unlike nearby New Hampshirites, for example) also tend to somewhat "raise" or "break" the "short a" sound the most before voiceless fricatives (followed by voiced stops, laterals, voiceless stops, and voiced fricatives), so that words like half, bath, and glass become [hf], [b] and [?ls], respectively. This trend began around the early-mid to mid-twentieth century, replacing the older Boston accent's London-like "broad a" system, in which those same words are transferred over to the PALM class /a/ (see "Declining features" below). The raised  may overlap with the non-rhotic realization of SQUARE as .
Boston accents make a greater variety of distinctions between short and long vowels before medial /r/ than many other modern American accents do: hurry /'h?ri/ and furry /'f?ri/; and mirror /'m?r?/ and nearer /'nr?/, though some of these distinctions are somewhat endangered as people under 40[clarification needed] in neighboring New Hampshire and Maine have lost them. In this case, Boston shares these distinctions with both New York and British accents, whereas other American accents, like in the Midwest, have has lost them entirely.
The nuclei of the diphthongs /a?/ and /a?/ may be raised to something like [?] before voiceless consonants: thus write has a higher vowel than ride and lout has a higher vowel than loud. This phenomenon, more famously associated with Canadian accents, is known by linguists as Canadian raising.
The nuclei of /o?/ and /u/ (in the words go and goo) are significantly less fronted than in many American accents. The latter may be diphthongized to [?u] or [?u].
Speakers of the more deeply urban varieties of the Boston accent may realize the English dental fricatives /?, ð/ as the dental stops [t?, d?], giving rise to a phonemic distinction between dental and alveolar stops; thus, those may sound closer to doze.
The traditional Boston accent is widely known for being non-rhotic (or "r-dropping"), particularly before the mid-20th century. Recent studies have shown that younger speakers use more of a rhotic (or r-ful) accent than older speakers. Non-rhoticity means the phoneme /r/ does not appear in coda position (where in English phonotactics it must precede other consonants, see English phonology - coda), as in most dialects of English in England and Australia; card therefore becomes /kad/ "cahd" and color /'k?l?/ "culluh". Words such as weird /wd/ and square /skw/ feature centering diphthongs, which correspond to the sequences of close and mid vowels + /r/ in rhotic AmE. The phonemicity of the centering diphthongs /, , , o?/ depends on a speaker's rhoticity.
A famous example of non-rhoticity (plus a fronted START vowel) is "Park the car in Harvard Yard", pronounced [p?ak ð? 'k?an ?hav?d 'jad], or as if spelled "pahk the cah(r) in Hahvud Yahd". Note that the r in car would usually be pronounced in this case, because the following word begins with a vowel.
The Boston accent possesses both linking R and intrusive R: That is to say, an /r/ will not be lost at the end of a word if the next word begins with a vowel, and indeed an /r/ will be inserted after a word ending with a central or low vowel if the next word begins with a vowel: the tuner is and the tuna is are both /ð? 'tun?rz/.
Many characteristics of the Boston accent may be retreating, particularly among younger residents. In the most old-fashioned of Boston accents, there may be a lingering resistance to the horse-hoarse merger, so that horse has the /?/ phoneme; this can cause the NORTH-LOT-THOUGHT merger, so that tort, tot and taught are phonemically all /t?t/. For this older Boston accent, horse is distinct from the FORCE vowel, as in hoarse /ho?s/. Other words fall into these distinct classes too, like for vs. four: /f?/ vs. /fo?/, mirroring RP as spoken at the beginning of the 20th century (though RP has a distinct LOT vowel). This distinction was rapidly fading out of currency in the second half of the 20th century (with the words belonging to the NORTH class being transferred over to the FORCE class, undoing the merger of NORTH with LOT-THOUGHT), as it is in almost all regions of North America that still make it. For rhotic speakers, both NORTH and FORCE are GOAT + /r/: /no?r?, fo?rs/ (phonetically closer to [no, fo?s]). The remaining centering diphthongs also disappear in the rhotic variety, so that near, cure and square are /nir, kjur, skwe?r/ (the last one is phonetically [skwe?]) instead of the traditional /n, kj, skw/.
A feature that Boston speakers once shared with Received Pronunciation, though now uncommon, is the "broad a" of the BATH lexical set of words, making a distinction from the TRAP set (). In particular words that in other American accents have the "short a" pronounced as /æ/, that vowel was replaced in the nineteenth century (if not earlier and often sporadically by speakers as far back as the late eighteenth century) with /a/: thus, half as /haf/ and bath as /ba?/. Fewer words have the broad a in Boston English than in the London accents, and fewer and fewer Boston speakers maintain the broad a system as time goes on, with its transition into a decline occurring in speakers born from about 1930 to 1950 (and first documented as a decline in 1977). Boston speakers born before about 1930 used this broad a in the words after, ask, aunt, bath, calf, can't, glass, half, laugh, pasture, path, and perhaps other words, and born from about 1930 to 1950 use it only in aunt, calf, half, laugh, and pass. Speakers born since 1950 typically have no broad a whatsoever and, instead, slight /æ/ raising (i.e. ), for example, in craft, bad, math, etc.) with this same set of words and, variably, other instances of short a too. Only aunt maintains the broad a sound in even the youngest speakers, though this one word is a common exception throughout all of the Northeastern U.S.
Although not all Boston-area speakers are non-rhotic, non-rhoticity remains the feature most widely associated with the region. As a result, it is frequently the subject of humor about Boston, as in comedian Jon Stewart joking in his book America that, although John Adams drafted the 1780 Massachusetts Constitution, "delegates from his state refused to ratify the letter 'R'".
Being conspicuous and easily identifiable as regional, Boston accents are routinely featured by actors in films set in Boston, particularly for working-class white characters, such as in Good Will Hunting, Mystic River, The Departed, Manchester by the Sea, The Town, Ted, The Fighter, and Black Mass. Television series based within a Boston setting such as Boston Public and Cheers have featured the accent. Simpsons character Mayor Quimby talks with an exaggerated Boston accent as reference to the former US Senator Ted Kennedy. Television comedy sketches have featured the accent, including "The Boston Teens" and "Dunkin Donuts" on Saturday Night Live, as well as "Boston Accent Trailer" on Late Night with Seth Meyers.
In The Heat, the family of Shannon Mullins all speak with the Boston accent and confusion arises from the pronunciation of the word narc as nahk /nak/. In the video game Team Fortress 2, the character Scout, who is himself a Boston native, talks with a distinct Boston accent, although it sometimes lapses into a Brooklyn accent.
Some words most famously associated with the Boston area are:
Many words common to Boston are also common throughout the New England dialects: blinkers for "automobile turn signals" (the Massachusetts Department of Transportation even has signs reminding motorists, with Boston phonetic spelling, to "Use Yah Blinkah"), packie (or package store) for "liquor store", and rotary for "traffic circle" (these full-speed circular intersections being common in Greater Boston).