off-gas

From off- +‎ gas.

off-gas (countable and uncountable, plural off-gases)

1. (manufacturing) Gas produced as a side effect of a chemical reaction, sometimes hazardous.

off-gas (third-person singular simple present off-gasses, present participle off-gassing, simple past and past participle off-gassed)

1. (of a solid or liquid) To emit gases, especially noxious ones.
   • 2004, Old-House Journal, page 86:

     Since solvent-based paints can off-gas for a long time as they dry, when trapped in a tightly sealed building they can contribute to an unhealthy cocktail of chemicals in the air.

• outgas

• desorption

• sag off