Question 1

What does "have second thoughts" mean?

Accepted Answer

To start to doubt a decision you have already made; to reconsider.

Question 2

How do you use "have second thoughts" in a sentence?

Accepted Answer

He started having second thoughts about moving abroad.

Question 3

Is "have second thoughts" formal or informal?

Accepted Answer

"have second thoughts" is register-neutral — appropriate in both casual and formal contexts. Often used before finalizing a commitment or action.