瞎忙活，徒劳无功

chase your own tail───追你自己的尾巴

change your tune───改变你的调子

chance your arm───试试你的胳膊

chase mortise───榫眼

chase the ball───追球

leave your mark───留下你的印记

lose your cool───失去冷静

lose your grip───失去控制

lose your rag───把你的破衣服丢掉

You help your dog chase its tail.───你帮助你的狗追它自己的尾巴跑。

If you don't want your image tarnished, chase your tail before you get into serious trouble.

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