ETYM AS. cin, akin to OS. kin, G kinn, Icel. kinn, cheek, Dan. and Swed. kind, Latin gena, Greek; cf. Skr. hanu.
The protruding part of the lower jaw; SYN. mentum.

To in gymnastics: raise oneself while hanging from one's hands until one's chin is level with the support bar; SYN. chin up.