have second thoughts
US /hæv ˌsek.ənd ˈθɑːts/
UK /hæv ˌsek.ənd ˈθɑːts/

1.
다시 생각하다, 마음을 바꾸다
to change your mind about something, or to start to doubt a decision you have made
:
•
I was going to buy that car, but I'm starting to have second thoughts.
그 차를 사려고 했는데, 다시 생각하게 돼.
•
She agreed to the plan, but later she had second thoughts.
그녀는 계획에 동의했지만, 나중에 다시 생각했다.