ex·pel 
(ĭk-spĕl)
(ĭk-spĕl)tr.v. ex·pelled, ex·pel·ling, ex·pels
1. To force or drive out: expel an invader.
2. To discharge from or as if from a receptacle: expelled a sigh of relief.
3. To deprive of membership or rights in an organization; force to leave: expelled the student from college for cheating.
[Middle English expellen, from Latin expellere : ex-, ex- + pellere, to drive; see pel-5 in the Appendix of Indo-European roots.]
ex·pella·ble adj.
ex·peller n.