back·wash

[bak-wosh, -wawsh]
noun
1.
Nautical. water thrown backward by the motion of oars, propellers, paddle wheels, etc.
2.
Aeronautics. the portion of the wash of an aircraft that flows to the rear, usually created by the power plant. Compare wash ( def 31 ).
3.
a condition, usually undesirable, that continues long after the event which caused it.
verb (used with object)
4.
to affect, as by hitting, rocking, or splashing, with a backwash: a powerful cutter backwashing the skiers.
5.
to clean out (a clogged filter) by reversing the flow of fluid: Backwash the swimming pool's filters regularly.
00:10
backwash is one of our favorite verbs.
So is hornswoggle. Does it mean:
to introduce subtleties into or argue subtly about.
to swindle, cheat, hoodwink, or hoax.

Origin:
1765–75; back2 + wash

back·wash·er, noun


3. aftermath, consequence, result, upshot.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
backwash (ˈbækˌwɒʃ) [Click for IPA pronunciation guide]
 
n
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
 
vb
5.  (tr) to remove oil from (combed wool)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

backwash
1876, Motion of a receeding wave," from back + wash.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
While relocating this pump, it is also recommended to provide additional support to the backwash piping.
The permit currently authorizes backwash disposal from a surface water treatment plant.
At that point, it would still be trapped in the backwash generated by the solar
  wind, and might someday be caught and carried off.
Backwash of the pressure filters is initiated when a predetermined pressure
  differential is reached.
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