flop

an arithmetic operation performed on floating-point numbers; "this computer can perform a million flops per second"

someone who is unsuccessful

a complete failure; "the play was a dismal flop"

the act of throwing yourself down; "he landed on the bed with a great flop"

fall loosely; "He flopped into a chair"

fall suddenly and abruptly

fail utterly; collapse; "The project foundered"

with a flopping sound; "he tumbled flop into the mud"

exactly; "he fell flop on his face"