Know how to use "fewer" and "less"? Find out.
shortened form of confess, attested by 1840, American English. Related: Fessed; fesses; fessing.
"white horizontal band across an escutcheon," late 15c., from Old French faisce, from Latin fascia (see fasces).
To confess; admit the truth: Then why doesn't the judge come clean and fess up?/ He finally fessed up to something that I've known a long time (1840+)