i. (noun) a social or religious custom prohibiting or restricting a particular practice or forbidding association with a particular person, place, or thing.
Sentence– In India there were many taboos around socialising with people from the lower castes.
ii. (adjective) prohibited or restricted by social custom
Sentence– Sending girls to school was a taboo until a few decades ago.
iii. (verb) place under a taboo
Sentence– Traditional societies taboo female handling of food during the celebrations.