[v] have as a by-product; "The big cities gave off so many wonderful American qualities" [v] 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"
emit, give out
absorb, take in
aerate, aerify, atomize, bleed, blow, breathe out, carbonate, chlorinate, discharge, distill, effuse, egest, eliminate, emit, etherify, etherize, evacuate, evaporate, excrete, exfiltrate, exhale, exhaust, expire, extravasate, exudate, exude, filter, filtr