To drive or force out or away; send off or away by force or constraint; compel to leave; dismiss forcibly or compulsorily: as, to expel air from a bellows or from the lungs; to expel an invader or a traitor from a country; to expel a student from a college, or a member from a club.To exclude; keep out or off.To reject; refuse.Synonyms Exile, Exclude, etc. (see banish), expatriate, ostracize; eject, dislodge.