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Phrase Meanings » let on
What does "let on" mean?
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Reveal one's true feelings or a fact, allow something to be known, as in Don't let on that you met her before. This usage is probably a shortening of let it on someone. [c. 1700]
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Pretend, as in He let on that he was very angry, but in fact he didn't care a bit. [First half of 1800s] Also see let in on.
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