briefs /bɹiːfs/ noun[plural only]4 •A very short, close-fitting type of underpants.[S]he learned not to iron my footy briefs and leave creases in them - the blokes bagged my creases for weeks[.] — 1995 •Male underpant bikini briefs.Galvanised, I jumped--the clatter of keys rang clear as I thrust the knife, handle down, into the back of my briefs. — 2012 •Swimming briefs.I fetched my briefs, pulled them on, and we left the changing room. — 2012 •(euphemistic) An adult diaper.
