名詞 second thought:

1. thinking again about a choice previously made
   同義詞：reconsideration, afterthought, rethink

1. He have intended to go, but on second thought, he give up the idea.
   他本來想去，但進一步考慮後，打消了這個念頭。
2. On second thought I think I'd better go now.
   再三考慮后，我想最好現在走。
3. You are so bold that you never do something on second thought.
   你太魯莽，從來不知道深思熟慮后做事。
4. Don't give it a second thought.
   別再去想它了。