flop into

• [口语]扑通一声跳进；一屁股坐下；沉重地倒在(床上)：

  He flopped into water.

  他扑通一声跳入水中。

  The travellers were so tired that they flopped into bed and fell asleep at once.

  旅行者们太累了，一头倒在床上就进入了梦乡。