adage (n.) Look up adage at Dictionary.com
"brief, familiar proverb," 1540s, Middle French adage (16c.), from Latin adagium "adage, proverb," apparently a collateral form of adagio, from ad- "to" (see ad-) + *agi-, root of aio "I say," from PIE *ag- (2) "to speak." But some find this unlikely and suggest the second element might be related to ago "set in motion, drive, urge." Related: Adagial.