backpressure

or back pres·sure

[ bak-presh-er ]

noun

1. 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.

Word History and Origins

Origin of backpressure¹

First recorded in 1860–65; back ¹( def ) + pressure ( def )