let out is a verb meaning "express audibly; utter sounds (not necessarily words)". It carries 4 recorded senses.
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”
“The newspaper uncovered the President's illegal dealings”
Definitions, synonyms and semantic relations for let out come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.