flop down

• [口语]猛然倒下(或躺下、坐下、跪下等)；啪嗒地落下；跨掉；失败：

  He flopped down on the chair.

  他一屁股坐在椅子上。

  The postman flopped his heavy bag down for a short rest.

  邮递员噗地一声放下沉重的包，休息一会儿。