big deal - definition and synonyms

noun [singular] spoken 

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  1. something that is very important
    it’s no big deal:

    It’s no big deal if you can’t pay me back right now.

    it’s not that big a deal:

    Relax – it’s not that big a deal if we’re five minutes late.

    make a big deal (out) of something (=behave as if it is very important):

    I know he’s done well in his exams, but I don’t see why he has to make such a big deal out of it!