Definition
To treat something as more important or significant than it actually is; to exaggerate the importance of something.
将某事过分重视，小题大作。
She was only a few minutes late, there's no need to make a big thing out of it.
她只是迟到了几分钟，没必要小题大做。
I made a small mistake, but he made a big thing of it.
我犯了一个小错误，但他却小题大做。
They seem to be making a big thing out of this event, which has made them all very nervous.
他们似乎对这件事小题大做，这让他们都感到非常紧张。