Definition of big deal noun from the Oxford Advanced American Dictionary

     

    big deal

     noun
    noun
     
    [singular](informal)
     
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  1. 1something that is very special or important Her first party dress was a big deal for the little girl. I had been to many such events before, but for some of the invitees it was a big deal.
  2. 2(ironic) used to say that something is not important So he earns more than me. Big deal! We lost the first game of the season, but it’s no big deal. Yes, we’re a little late, but what’s the big deal?
  3. Idioms
    make a big deal out of something,make something into a big deal
     
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    to try to make something seem more important than it really is She always makes a big deal out of her kids’ piano recitals. Why do you have to make this little incident into such a big deal?