Let out, say (5)
I believe the answer is:
utter
This clue is a double definition.
'let out' is the first definition.
(thesaurus)
'say' is the second definition.
(to utter something is to speak or say it)
(Other definitions for utter that I've seen before include "Speak; completely" , "Positive" , "(Of counterfeit money) put into circulation - say" , "State - unqualified - rank" , "Give tongue to" .)