v., n., & adv.
v.intr. (flopped, flopping) 1 sway about heavily or loosely (hair flopped over his face). 2 move in an ungainly way (flopped along the beach in flippers). 3 (often foll. by down, on, into) sit, kneel, lie, or fall awkwardly or suddenly (flopped down on to the bench). 4 sl. (esp. of a play, film, book, etc.) fail; collapse (flopped on Broadway). 5 sl. sleep. 6 make a dull sound as of a soft body landing, or of a flat thing slapping water.
n. 1 a a flopping movement. b the sound made by it. 2 sl. a failure. 3 sl. esp. US a bed.
adv. with a flop. flop-house sl. esp. US a doss-house.
[ var. of FLAP ]