The Collaborative International Dictionary of English v.0.48:
Chin \Chin\ (ch[i^]n), n. [AS. cin, akin to OS. kin, G kinn,
Icel. kinn, cheek, Dan. & Sw. kind, L. gena, Gr. ?; cf.
Skr. hanu. [root]232.]
1. The lower extremity of the face below the mouth; the point
of the under jaw.
2. (Zool.) The exterior or under surface embraced between the
branches of the lower jaw bone, in birds.
Moby Thesaurus II by Grady Ward, 1.0:
35 Moby Thesaurus words for "chin":
bandy words, bat the breeze, beat the gums, button, causerie, chat,
chew the fat, chew the rag, colloque, colloquize, commerce with,
commune with, communicate, communicate with, confab, confabulate,
converse, converse with, discourse with, jaw, mentum, prose, rap,
shoot the breeze, speak with, spiel, take counsel with, talk,
talk together, visit, visit with, yak, yakkety-yak, yap, yarn