n. 25B6; verb
he flopped into a chair : COLLAPSE, slump, crumple, subside, sink, drop.
his hair flopped over his eyes : HANG (DOWN), dangle, droop, sag, loll.
(informal) the play flopped : BE UNSUCCESSFUL, fail, not work, fall flat, founder, misfire, backfire, be a disappointment, do badly, lose money, be a disaster; informal bomb, go to the wall, come a cropper, bite the dust, blow up in someone's face; N. Amer. informal tank.
succeed.
25B6; noun (informal) the play was a flop : FAILURE, disaster, debacle, catastrophe, loser; Brit. damp squib; informal flopperoo, washout, also-ran, dog, lemon, non-starter; N. Amer. informal clinker.
success.