noun
a social or religious custom prohibiting or restricting a particular practice or forbidding association with a particular person, place, or thing
adjective
prohibited or restricted by social custom
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Discussing mental health used to be considered taboo in many cultures.
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Talking about money is often seen as taboo in some families.
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Using curse words in front of children is a big taboo for some parents.
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Breaking traditional gender roles can still be seen as a taboo in certain societies.