colloquialism

[kuh-loh-kwee-uh-liz-uhm]
noun
2.
colloquial style or usage.

Origin:
1800–10; colloquial + -ism

colloquialist, noun
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World English Dictionary
colloquialism (kəˈləʊkwɪəˌlɪzəm)
 
n
1.  a word or phrase appropriate to conversation and other informal situations
2.  the use of colloquial words and phrases

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

colloquialism
1810, "a colloquial word or phrase," from colloquial + -ism.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Colloquialisms that would be charming once become grating and lazy when you
  meet them page after page.
The different colloquialisms that develop are purely locale-based and there's
  nothing officialdom can do about it.
Many colloquialisms are almost by definition clichés as well, so they can lower
  the tone without necessarily freshening the story.
Students will recognize how colloquialisms and jargon reflect context, regions
  and cultures.
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