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.
Also, back pressure. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
If exhaust backpressure exceeds certain thresholds, the operator is notified
  that maintenance is needed.
These sources of backpressure can supply higher water pressures than the
  incoming water supply and cause a reverse flow of water.
For instance, backpressure backflow may take place if the public water supply
  is connected to a high-pressure boiler.
Excessive backpressure can cause the engine to stall, thereby terminating
  vehicle operation.
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