Meaning of waste gate

waste' gate"

Pronunciation: [key]
— Auto. Auto.
  1. a valve in a turbocharger unit that automatically opens when a predetermined engine speed is reached, so that some of the exhaust gas to the turbine is diverted and the engine speed does not become excessive.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.