the noise of a rounded object dropping into a liquid without a splash

drop something with a plopping sound

drop with the sound of something falling into water

set (something or oneself) down with or as if with a noise

同义词：plank??/??flump??/??plonk??/??plunk??/??plump down??/??plunk down??/??plump

with a short hollow thud

同义词：plunk