a flow of a liquid opposite to the usual or desired direction.

1880–85; back2 + flow Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To backflow
Example sentences
Backflow is the undesirable reversal of the flow of water.
If you have your backflow device inspected or installed please keep a copy of this for your records.
The easiest way to keep you and your family safe from the potential hazards of backflow is to not create cross connections.
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