Verb let on has 1 sense
- disclose, let on, bring out, reveal, discover, expose, divulge, impart, break, give away, let out - make known to the public information that was previously known only to a few people or that was meant to be kept a secret; "The auction house would not disclose the price at which the van Gogh had sold"; "The actress won't reveal how old she is"; "bring out the truth"; "he broke the news to her"
--1 is one way to tell
Sample sentence:
They let on that there was a traffic accident
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