1 to send sth out (a liquid, gas, etc) 排出（液体、气体等）: Smoke and fumes are discharged from the factory.工厂排出烟和废气。
2 to allow sb officially to leave; to send sb away 准予离去；遣送: to discharge sb from hospital让某人出院
3 to do sth that you have to do 履行；执行: to discharge a duty/task履行义务；执行任务
discharge²
/ˈdɪstʃɑ:dʒ ||; ˈdɪstʃɑrdʒ/noun[C,U]
1 the action of sending sb/sth out or away 放出；排出；遣送: The discharge of oil from the leaking tanker could not be prevented.当时没法制止石油从油轮裂缝漏出来。The wounded soldier was given a medical discharge.那个受伤的士兵已获准退伍。
2 a substance that has come out of somewhere 排放物: yellowish discharge from a wound伤口的淡黄色分泌物