[bak-wosh, -wawsh]
Nautical. water thrown backward by the motion of oars, propellers, paddle wheels, etc.
Aeronautics. the portion of the wash of an aircraft that flows to the rear, usually created by the power plant. Compare wash ( def 31 ).
a condition, usually undesirable, that continues long after the event which caused it.
verb (used with object)
to affect, as by hitting, rocking, or splashing, with a backwash: a powerful cutter backwashing the skiers.
to clean out (a clogged filter) by reversing the flow of fluid: Backwash the swimming pool's filters regularly.

1765–75; back2 + wash

backwasher, noun

3. aftermath, consequence, result, upshot. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
backwash (ˈbækˌwɒʃ)
1.  Compare swash a sucking movement of water, such as that of retreating waves
2.  water washed backwards by the motion of oars or other propelling devices
3.  the backward flow of air set up by an aircraft's engines
4.  a condition resulting from a previous event; repercussion
5.  (tr) to remove oil from (combed wool)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1876, Motion of a receeding wave," from back + wash.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And they do run a risk of letting ideology backwash into their technical
At that point, it would still be trapped in the backwash generated by the solar
  wind, and might someday be caught and carried off.
Our makeshift campsite was blown to tatters by the backwash of the furious
Many have little mesh windscreens that pop up behind drivers to prevent a
  backwash of air.
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