"Crazy Guessing Idioms" has one person in the middle of the two words, and he can't think about it hard. What kind of idiom is this?

Crazy guessing idiom and thoughtsThe middle oneAnswer:

The correct answer is think before and after.

A careful observation of the picture shows that this person in the middle of thoughts is not facing us, but standing sideways. In other words, the word "think" is right in front of him, and the word "think" is behind him. By the way, the editor will be upset every time he sees the answer. Why didn’t he expect it to be so simple? QAQ! I wonder if all the players have the same troubles?