What does jawbone mean?
A jawbone is the bone that forms the lower jaw, the movable part of the face used in biting and chewing. In medical contexts, the term is useful because it identifies a specific structure and appears in phrases such as 'broken jawbone' and 'jawbone fracture.' In informal American English, the same word can be used as a verb to mean talking or arguing at length, often in a way that suggests heated, persistent, or sometimes tedious discussion. The compound is easy to understand literally: it names a bone belonging to the jaw. Although 'jaw' is the broader everyday term and 'mandible' is the more formal anatomical synonym, 'jawbone' gives a clear focus on the bony structure itself. It can therefore describe both a precise anatomical feature and, in less formal contexts, an extended verbal exchange.
The bone forming the lower jaw.
"The doctor diagnosed a fracture of the jawbone."
Also used in medical and anatomical descriptions; 'mandible' is a more formal synonym.
To talk or argue at length, especially in an informal or heated way.
"They jawboned about the decision until midnight."
Informal and especially common in American English.
The standard plural of the noun is 'jawbones.'
"The museum displays the jawbones of several extinct mammals."
The word is a transparent compound: a jaw is the part of the face, and a bone is the hard material that gives it structure.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does jawbone come from?
The word is an English compound formed from 'jaw' and 'bone.' Its anatomical sense developed from the straightforward combination of the two component words, while the informal verb meaning 'to talk or argue at length' is a later figurative extension based on the idea of moving the jaw in sustained speech.
How jawbone is actually used
As a noun, 'jawbone' is standard and broadly used. As a verb, it is informal and particularly associated with American English; 'jaw' or 'talk' is usually more neutral. The expression 'drop one's jaw' refers to extreme surprise or astonishment.
Easily confused with jawbone
'Jaw' can refer to the whole lower structure of the face, including the bone and surrounding tissues, whereas 'jawbone' specifically names the bone.
'Mandible' is a formal anatomical term for the lower jaw or its bone, while 'jawbone' is the common English word.