Making a mountain out of a molehill is an idiom referring to over-reactive, histrionic behaviour where a person makes too much of a minor issue. It seems to have come into existence in the 16th century.
双语例句
1
I'm tired of listening to John makeamountainoutofamolehill.
我受不了约翰的小题大做，他不断抱怨一些不要的事。
2
You're not hurt badly. Stop trying to makeamountainoutofamolehill with crying.
你伤得并不重，不要大惊小怪地嚷嚷，小题大做了。
3
Your "broken arm" was only a sprained wrist. Don't makeamountainoutofamolehill.