Answer: plopped

AnswerCrossword Clue
PLOPPEDSat without ceremony
PLOPPEDSat (down) ungracefully
PLOPPEDSat (down)
PLOPPEDFell into a seat
PLOPPEDFell with the sound of a flat dive.
PLOPPEDFell heavily
ploppedPLOP, to fall or drop heavily, also PLUNK, PLONK
ploppedSit or lie down gently but clumsily
ploppedFall or cause to fall with such a sound