S: (v) exhaust, discharge, expel, eject, release (eliminate (a substance)) "combustion products are exhausted in the engine"; "the plant releases a gas"
S: (v) drop, drop off, set down, put down, unload, discharge (remove (cargo, people, etc.) from and leave) "unload the cargo"; "drop off the passengers at the hotel"
S: (v) fire, discharge (cause to go off) "fire a gun"; "fire a bullet"