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backpressure

or back pres·sure

[bak-presh-er]
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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.
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Origin of backpressure

First recorded in 1860–65; back1 + pressure
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018