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“一不做，二不休”，汉语俗语，意思是要么不做，做了就索性做到底。指事情既然做了开头，就坚持到底。可以翻译为“be determined to go the whole hog，或once it is started, go through with it”等。
例句：
到这地步，我们只好一不做二不休。
Now that we’ve gone as far as this, we must go the whole hog or drop it altogether.
我想索性一不做二不休，干脆把头发染了。
I thought I might as well go the whole hog and have my hair dyed as well.