If you plunk something somewhere, you put it there without great care.
例句
Melanie plunked her cosmetic case down on a chair...梅拉妮把化妆盒砰的一声扔到椅子上。She swept up a hat from where it had fallen on the ground, and plunked it on her hair.她拾起掉在地上的一顶帽子,随意地往头上一扣。
VERB
(使)砰地坐下;(使)重重地坐下
If you plunk yourself somewhere, or plunk down, you sit down heavily and clumsily.
例句
I watched them go and plunked down on one of the small metal chairs.我目送他们离去,然后一屁股坐在其中一把金属小椅子上。