Etymology
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jaw (n.)

late 14c., jowe, joue, "the bones of the mouth," "A word of difficult etymology" [OED]. Probably from Old French joue "cheek," originally jode, from Gallo-Romance *gauta or directly from Gaulish *gabata, but there are phonetic problems; or perhaps a variant of Germanic words related to chew (v.); compare also the two nouns jowl. Replaced Old English ceace, ceafl. Jaws as "holding and gripping part of an appliance" is from mid-15c.; figuratively, of time, death, defeat, etc., from 1560s.

jaw (v.)

1610s, "to catch in the jaws, devour," from jaw (n.). In slang from 1748, "to gossip, to speak;" 1810 as "to scold." Related: Jawed; jawing. Hence 19c. U.S. slang jawsmith "talkative person; loud-mouthed demagogue" (1887), nautical slang jaw-tackle "the mouth" (1829), and the back-formed colloquial noun jaw "rude talk, abusive clamor" (1748).

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Definitions of jaw
1
jaw (v.)
talk socially without exchanging too much information;
Synonyms: chew the fat / shoot the breeze / chat / confabulate / confab / chitchat / chit-chat / chatter / chaffer / natter / gossip / claver / visit
jaw (v.)
talk incessantly and tiresomely;
Synonyms: yack / yack away / rattle on / yap away
jaw (v.)
chew (food); to bite and grind with the teeth;
He jawed his bubble gum
Synonyms: chew / masticate / manducate
jaw (v.)
censure severely or angrily;
Synonyms: call on the carpet / take to task / rebuke / rag / trounce / lecture / reprimand / dress down / call down / scold / chide / berate / bawl out / remonstrate / chew out / chew up / have words / lambaste / lambast
2
jaw (n.)
the part of the skull of a vertebrate that frames the mouth and holds the teeth;
jaw (n.)
the bones of the skull that frame the mouth and serve to open it; the bones that hold the teeth;
jaw (n.)
holding device consisting of one or both of the opposing parts of a tool that close to hold an object;
From wordnet.princeton.edu