He gave the donkey a mighty prod in the backside.

他在驴的屁股上狠狠地捅了一下。

《柯林斯英汉双解大词典》

I tried to run, too, but met up with Frank's backside.

我转身想逃，却撞上了弗兰克的后背。

youdao

Be careful or you'll fall on your backside.

小心点，不然你会仰天摔一跤。

youdao

Be careful or you'll fall on your backside.

小心点，不然你会仰天摔一跤。

youdao