What is the meaning of expelling?

noun

• Any of several bodily processes by which substances go out of the body.
  • usage: "the discharge of pus"
  • synonyms: discharge, emission

verb

• Force to leave or move out.
  • usage: "He was expelled from his native country"
  • synonyms: expel, 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, expel
• Cause to flee.
  • usage: "rout out the fighters from their caves"
  • synonyms: rout, rout out, expel
• Eliminate (a substance. )
  • usage: "combustion products are exhausted in the engine"; "the plant releases a gas"
  • synonyms: exhaust, discharge, expel, eject, release