Let out, free (7)
I believe the answer is:
release
I believe this is a double definition.
'let out' is the first definition.
(synonyms)
'free' is the second definition.
(to release someone is to free them)
(Other definitions for release that I've seen before include "put out" , "Prisoner eagerly awaits this" , "Free from confinement" , "Free - delivery" , "Liberate" .)