Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

1933, from phrase to speak with one's tongue in one's cheek "to speak insincerely" (1748), which somehow must have been suggestive of sly irony or humorous insincerity, but the exact notion is obscure.

MORE RELATED WORDS FOR TONGUE-IN-CHEEK

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.