What is the meaning of expel?

verb

• Force to leave or move out.
  • usage: "He was expelled from his native country"
  • synonyms: throw out, kick out
• Remove from a position or office.
  • usage: "The chairman was ousted after he misappropriated funds"
  • synonyms: oust, throw out, drum out, boot out, kick out
• Cause to flee.
  • usage: "rout out the fighters from their caves"
  • synonyms: rout, rout out
• Eliminate (a substance. )
  • usage: "combustion products are exhausted in the engine"; "the plant releases a gas"
  • synonyms: exhaust, discharge, eject, release