fess (v.)youdaoicibaDictYouDict
shortened form of confess, attested by 1840, American English. With up (adv.) from 1930. Related: Fessed; fesses; fessing.
fess (n.)youdaoicibaDictYouDict
wide horizontal band across an escutcheon, late 15c., from Old French faisce, from Latin fascia "a band" (see fasces).