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backpressure

or back pressure

[bak-presh-er] /ˈbækˌprɛʃ ər/
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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Based on the Random House Dictionary, © Random House, Inc. 2015.
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