Brush up on sth

FIGURE OUT
It’s complicated and I don’t think it’s easy to figure out a solution.
BRUSH UP ON STH
I thought I’d brush up on my French before going to Paris.
GIVE UP
I started learning English 2 years ago and I ‘m not intended to give up.
HANG OUT
We enjoyed hanging out with each other when we were kids.
SHOW OFF
She only bought that sport car to show off and prove she could afford one.