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in fun is an adverb meaning "not intended seriously; meant as a joke". It carries one recorded sense.
not intended seriously; meant as a joke
“some of the girls did go to extremes, but it was all in fun”
“let's pretend we don't like Mary, just for fun”
Definitions, synonyms and semantic relations for in fun come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .