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Meaning of after-run

af•ter-run

Pronunciation: (af'tur run", äf'-), [key]
— n.
  1. the continued running of an internal-combustion engine after the ignition is switched off:Also called Heavy carbon buildup can cause annoying engine after-run.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.