: after thinking about something again On second thought, I think I'll go after all.

Is it on second thought or on second thoughts?

You can say on second thoughts or on second thought when you suddenly change your mind about something that you are saying or something that you have decided to do. "Wait there!" Kathryn rose.

How do you use second thoughts?

Examples of second thought in a Sentence

After she agreed to lend him the money, she had second thoughts. She was having second thoughts about getting married. He hardly gave it a second thought.