#1 let out v. express audibly; utter sounds (not necessarily words); "She let out a big heavy sigh"; "He uttered strange sounds that nobody could understand". wn
#2 let out v. 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 o. wn
#3 let out v. bring out of a specific state. wn
#4 let out v. make (clothes) larger; "Let out that dress--I gained a lot of weight". wn
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