figure out

(verb) to try and understand the cause of a problem

Example Sentence:

The roommates tried for four hours to figure out why their apartment smelled so bad. Then they realized it was because it was dirty.

A: I can’t figure out why I keep getting this math problem wrong.
B: Here, let me help you.

Boyfriend: Why are you so upset?
Girlfriend: You should be able to figure it out . You had sex with my sister!

Media:

Similar idioms:

1. sort out
2. rub someone the wrong way
3. cat got your tongue
4. get around
5. bring something out into the open