1N-SING 大事;要事 If you say that something is a big deal, you mean that it is important or significant in some way. 大事;要事 [informal]
I felt the pressure on me, winning was such a big deal for the whole family.
我感觉到了压力,取胜对全家来说是如此重要。
It's no big deal.
这没什么大不了的。
2PHRASE 对…大惊小怪(或小题大做) If someone makes a big deal out of something, they make a fuss about it or treat it as if it were very important. 对…大惊小怪(或小题大做) [informal]
The Joneses make a big deal out of being 'different'. [+ out of/of/about]
爱攀比的邻居们很是把“与众不同”当回事。
3CONVENTION 有什么了不起 You can say 'big deal' to someone to show that you are not impressed by something that they consider important or impressive. 有什么了不起 [informal, feelings]