flop

flop verb [ I ] uk/flɒp/ uspresent participle flop ping | past tense and past participle flop ped   flop down/into/onto, etc
to fall or sit somewhere suddenly in a heavy or relaxed way

плюхнуться, шлепнуться
He flop ped down on the sofa. flop verb [I]
(NOT SUCCESSFUL)If a film, product, plan, etc flop s, it is not successful.

проваливаться, терпеть неудачу

FLOP noun

[ C ]
 informal uk/flɒp/ us flop noun [C]
(MOVEMENT)

a movement towards the ground, or the noise someone or something makes as they fall down

шлепок, хлопок
She fell onto the bed with a flop .