The verb emit has 3 senses (first 2 from tagged texts)
1. (3) emit, breathe, pass off -- (expel (gases or odors))
2. (1) emit, give out, give off -- (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")
3. utter, emit, let out, let loose -- (express audibly; utter sounds (not necessarily words); "She let out a big heavy sigh"; "He uttered strange sounds that nobody could understand")