Definitions for no-no
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Random House Webster's College Dictionary
no′-no`(n.)(pl.)-nos, -no's.
Informal.anything that is forbidden or not advisable, as because of being improper or unsafe.
Category: Common Vocabulary, Informal
Origin of no-no:
1940–45
Kernerman English Learner's Dictionary
no-no(noun)ˈnɒnˈfæt
sth that is completely unacceptable
Criticizing your friends' family is a big no-no.
Wiktionary
no-no(Noun)
Something that is forbidden, prohibited, discouraged or taboo.
Smoking indoors is becoming a real no-no these days, in many places.
no-no(Noun)
A no-hitter; a game in which no batter on one of the teams got a hit.
He threw two no-nos in his career.
Citation
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"no-no." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/no-no>.

