or back pres·sure

[ bak-presh-er ]
/ ˈbækˌprɛʃ ər /


a resistant pressure exerted by liquid or gas against the forward motion or flow of an exhaust or pipe system: Careful control of backpressure ensures an even supply of oil from the well.

Origin of backpressure

First recorded in 1860–65; back1 + pressure Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019