make a big thing (out) of
US /meɪk ə bɪɡ θɪŋ (aʊt) əv/
UK /meɪk ə bɪɡ θɪŋ (aʊt) əv/

1.
小题大做, 大惊小怪
to treat something as more important or serious than it really is
:
•
It was just a small mistake, don't make a big thing out of it.
那只是个小错误,别小题大做。
•
She tends to make a big thing of every little problem.
她总是喜欢把小问题搞得很大。