[C] either of the two bones at the bottom of the face that contain the teeth and move when you talk or eat 颌
the top/upper jaw
上颌
the bottom/lower jaw
下颌
[sing.] the lower part of the face; the lower jaw 下巴；下颌
He has a strong square jaw.
他长着结实的方下巴。
The punch broke my jaw.
这一拳打坏了我的下巴。