1. (verb)utter, emit, let out, let loose express audibly; utter sounds (not necessarily words) "She let out a big heavy sigh"; "He uttered strange sounds that nobody could understand"
2. (verb)unwrap, disclose, let on, bring out, reveal, discover, expose, divulge, break, give away, let out make known to the publicinformation 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"
3. (verb)bring out, let out bring out of a specificstate
4. (verb)let out, widen make (clothes) larger "Let out that dress--I gained a lot of weight"
Definitions of let out 
