back·flow

[bak-floh]
noun
a flow of a liquid opposite to the usual or desired direction.

Origin:
1880–85; back2 + flow

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
backflow

noun
a flow that returns toward its source 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Backflow is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a fool or simpleton; ninny.
Example sentences
The easiest way to keep you and your family safe from the potential hazards of backflow is to not create cross connections.
If you have your backflow device inspected or installed please keep a copy of this for your records.
Backflow is the undesirable reversal of the flow of water.
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