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on (PRETEND) [phrasal verb] [M] - to appear to have (a feeling or way of behaving that is not real or not natural for you)Why are you putting on that silly voice?There's no need to put on that injured expression - you know you're in the wrong.They give the impression of coming from a wealthy background, but it's all put on really.I can't tell whether he's really upset, or if he's just putting it on (= pretending to feel that way).