What is the meaning of let out?

verb

• Express audibly; utter sounds (not necessarily words. )
  • usage: "She let out a big heavy sigh"; "He uttered strange sounds that nobody could understand"
  • synonyms: utter, emit, let loose
• Make known to the public information that was previously known only to a few people or that was meant to be kept a secret.
  • usage: "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"
  • synonyms: unwrap, disclose, let on, bring out, reveal, discover, expose, divulge, break, give away
• Bring out of a specific state.
  • synonyms: bring out
• Make (clothes) larger.
  • usage: "Let out that dress-I gained a lot of weight"
  • synonyms: widen