- lit. either don't do it, or don't rest (idiom)
- fig. if you do it at all, you may as well go the whole hog
- in for a penny, in for a pound
“once it is started, go through with it; a thing once begun should not be put off until done”
原意是要么不做，做了就索兴做到底。指事情既然做了开头，就索兴做到底。
出处 唐·赵元一《奉天录》卷四：“光晟临死言曰：‘传语后人，第一莫作，第二莫休。’”
示例 到这地步，～，我是打算拼一拼了。（茅盾《子夜》七）