#1 expel v. [throw out, kick out] force to leave or move out; "He was expelled from his native country". wn
#2 expel v. [oust, throw out, drum out, boot out, kick out] remove from a position or office; "The chairman was ousted after he misappropriated funds". wn
#3 expel v. [rout, rout out] cause to flee; "rout out the fighters from their caves". wn
#4 expel v. [exhaust, discharge, eject, release] eliminate (a substance); "combustion products are exhausted in the engine"; "the plant releases a gas". wn
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