1 N-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]
2 PHRASE 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]
3 CONVENTION 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]
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