Table of Contents POS
WORDNET DICTIONARY
THESAURUS

RELATED WORDS : let let alone let be let down let drive let drop let fly let fly at let go let go of let in let in on let it go let loose let off let out let pass let ride let slide let slip let the cat out of the bag let up let well enough alone live and let live

WORDNET DICTIONARY

Verb let on has 1 sense

• let on(v = verb.communication) break, bring out, disclose, discover, divulge, expose, give away, let out, reveal, unwrap - 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"; "unwrap the evidence in the murder case"
is one way to tell
Sample sentence:
They let on that there was a traffic accident

THESAURUS

let on

acknowledge, act, act a part, admit, admit everything, affect, allow, assume, avow, betray, bluff, come clean, concede, confess, cop a plea, counterfeit, cover up, disclose, dissemble, dissimulate, divulge, fake, feign, four-flush, gammon, give away, grant, let on like, let out, make a pretense, make as if, make believe, make like, open up, out with it, own, own up, play, play a part, play possum, playact, plead guilty, pretend, profess, put on, sham, simulate, spill, spill it, spit it out, tell, tell all, tell the truth, uncover

For further exploring for "let on" in Webster Dictionary Online