Colloquialism
Pronunciation : Col*lo"qui*al*ism
Part of Speech : n.
Definition : Defn: A colloquial expression, not employed in formal discourse or writing.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder