Answer: gassing

AnswerCrossword Clue
GASSINGUse of chlorine.
GASSINGTalking idly: Slang.
gassingKill by exposure to poisonous gas
gassing(of a storage battery or dry cell) Give off gas
gassingAttack with or expose to poisonous gas
gassingFill the tank of (an engine or motor vehicle) with gasoline
gassinga poisoning by noxious gases
gassingTalk, esp. excessively, idly, or boastfully