A dialectal or archaic term possibly referring to backtalk, impertinence, or cheek; the rear part of the jaw or a jaw-like mechanical component at the back of something.
Compound of 'back' and 'jaw.' This appears to be rare or specialized terminology, possibly regional or technical in nature. Etymology is uncertain without clear historical documentation.
Backjaw is one of those words that feels like it should mean something obvious—but checking multiple dictionaries reveals how many terms have drifted out of common use entirely.
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