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

n the act of expelling or projecting or ejecting

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

n the act of forcing out someone or something

“the ejection of troublemakers by the police”
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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