They threatened to do him in if he didn't pay the money he owed them.他们威胁他,如果不还钱的话,就干掉他。
He's been so depressed lately that his friends are afraid he might do himself in. [=he might kill himself]他近来非常沮丧,朋友们都担心他会自杀。
:to cause the death of (someone)(使)死亡
He struggled with lung disease for many years, but it was a heart attack that finally did him in.他与肺病抗争了很多年,但最终夺去他生命的却是心脏病。
b :to cause the failure of (someone)(使)失败
His inability to attract Southern voters is what finally did him in as a presidential candidate. [=he failed because he was unable to attract Southern voters]他因没能赢得南方选民的支持而在总统竞选中失败。
a businessman who was done in by greed因贪婪而失败的商人
2
:to make (someone) very tired(使)劳累,筋疲力尽
Working in the garden all day really did me in. = After working in the garden all day, I was/felt done in. [=exhausted]在花园干了一整天,累得我够呛。