no–no
2 ENTRIES FOUND:
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plural
no–no's
or
no–nos
plural
no–no's
or
no–nos
Learner's definition of NO–NO
[count]
informal
1
:
something that people are not supposed to do because it is not proper, safe, fashionable, etc.
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Forgetting to introduce your guests to one another is a big no-no when hosting a party.
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Sharing prescription medication with other people is a definite no-no.
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fashion no-no's
2
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