Hypertext Webster Gateway: "colloquialism"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Colloquialism \Col*lo"qui*al*ism\, n.
A colloquial expression, not employed in formal discourse or
writing.
From WordNet (r) 1.7 (wn)
colloquialism
n : a colloquial expression; characteristic of spoken or written
communication that seeks to imitate informal speech
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