sagEnglishOxford English Thesaurussag verb 1 he sagged back in his chair: sink, subside, slump, crumple, loll, flop. 2 the house is very old and the floors all sag: curve down, hang down, dip, droop, swag, bulge, bag. 3 his spirits sagged as the team suffered yet another defeat: falter, weaken, languish, flag, fade, wilt, shrivel, wither, fail, fall. 4 industrial production has sagged: decline, fall, go down, drop, drop/fall off, turn down, decrease, diminish, reduce, sink; slump, plummet, fall off a cliff, tumble; informal crash, take a nosedive, nosedive.sag (1) Oxford Dictionary of English