to be full of oneself, to think too highly of oneself
Aquela garota se acha só porque apareceu na televisão.
That girl is full of herself just because she appeared on television.
The expression achar-se is the reflexive use of the verb achar ("to find" or "to think/consider"), so it literally means "to find oneself" — that is, to consider oneself something special.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.
