on second thought

(idiom) a change of opinion after thinking about something again

Example sentence:

Mom: Do you want some more dinner?
Son: No thank you.
Mom: Are you sure, you still look hungry?
Son: Well, on second thought, yes I will have some more!

Similar idioms:

1. food for thought
2. a leopard can’t change its spots
3. got a screw loose
4. you can’t teach an old dog new tricks
5. change one’s tune
6. what do you say?
7. not all there
8. so hungry one could eat a horse
9. off one’s rocker
10. change of pace
11. bottomless pit
12. change of heart
13. grab a bite
14. jump into something
15. turn to