big deal

1 ENTRIES FOUND:
big deal noun
big deal
noun
Britannica Dictionary definition of BIG DEAL
[singular]
: something that is very important
— often used in negative statements
— sometimes used ironically as an interjection to say that something is not important to you

make a big deal (out) of (something)

or make (something) into a big deal
: to treat (something) as very important or too important