verb (used with object), expelled, expelling.
to drive or force out or away; discharge or eject: to expel air from the lungs; to expel an invader from a country.
to cut off from membership or relations: to expel a student from a college.

1350–1400; Middle English expellen < Latin expellere to drive out, drive away, equivalent to ex- ex-1 + pellere to push, drive

expellable, adjective
reexpel, verb (used with object), reexpelled, reexpelling.
unexpellable, adjective
unexpelled, adjective

2. oust, dismiss, exile, excommunicate.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
expel (ɪkˈspɛl)
vb , -pels, -pelling, -pelled
1.  to eject or drive out with force
2.  to deprive of participation in or membership of a school, club, etc
[C14: from Latin expellere to drive out, from pellere to thrust, drive]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., from L. expellere "drive out," from ex- "out" + pellere "to drive." Meaning "to eject from a school" is first recorded 1640s. Related: Expelled; expelling.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Now, once again, politicians are appealing to the desire to expel and remove
  bad elements from society.
And the little buggers also use our attempts to expel them with vomiting and
Knead dough on a lightly floured work surface to expel air.
Aerosol cans contain liquid under pressure, which is used to expel the contents.
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