emit
verb.
expel (gases or odors)
Synonym: breathe, pass off
verb.
give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
The ozone layer blocks some harmful rays which the sun emits
Synonym: give off, give out
verb.
express audibly; utter sounds (not necessarily words)
She let out a big heavy sigh|He uttered strange sounds that nobody could understand
Synonym: let loose, let out, utter
Antonym: absorb