The action of something being forced or thrown out is called ejection. If you notice an ejection of black smoke from your car's tail pipe, you'll probably want to take it to a repair shop.

There is the physical kind of ejection, when a substance or object is propelled or projected away from or out of something else, like the ejection of a bullet from a gun or the ejection of lava from a volcano. Another kind of ejection happens when someone is instructed or forced to leave, like the ejection of a rowdy customer from a bar or an unpopular politician from public office. The Latin root, eicere, means "throw out."

Definitions of ejection
  1. noun
    the act of expelling or projecting or ejecting
    synonyms: expulsion, forcing out, projection
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    belch, belching, burp, burping, eructation
    a reflex that expels gas noisily from the stomach through the mouth
    the forceful expulsion of something from inside
    coughing up
    the act of expelling (food or phlegm) by coughing
    expectoration, spit, spitting
    the act of spitting (forcefully expelling saliva)
    disgorgement, emesis, regurgitation, vomit, vomiting
    the reflex act of ejecting the contents of the stomach through the mouth
    regurgitation of small amounts of food; seen in some infants after feeding
    haematemesis, hematemesis
    vomiting blood
    severe and excessive vomiting
    type of:
    actuation, propulsion
    the act of propelling
  2. noun
    the act of forcing out someone or something
    “the ejection of troublemakers by the police”
    synonyms: exclusion, expulsion, riddance
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    the act of throwing someone or something out of a window
    the expulsion from a country of an undesirable alien
    the act of excluding someone from society by general consent
    barring, blackball
    the act of excluding someone by a negative vote or veto
    ouster, ousting
    the act of ejecting someone or forcing them out
    deposition, dethronement
    the act of deposing someone; removing a powerful person from a position or office
    type of:
    banishment, proscription
    rejection by means of an act of banishing or proscribing someone
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