ex·fil·trate

[eks-fil-treyt, eks-fil-treyt] verb, ex·fil·trat·ed, ex·fil·trat·ing.
verb (used without object)
1.
to escape furtively from an area under enemy control.
verb (used with object)
2.
to smuggle (military personnel) out of an area under enemy control.

Origin:
1965–70; ex-1 + (in)filtrate

ex·fil·tra·tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Dictionary.com's 21st Century Lexicon
Main Entry:  exfiltrate
Part of Speech:  v
Definition:  to withdraw troops surreptitiously, esp. from a dangerous position
Etymology:  opposite of infiltrate, back formation of exfiltration 'filtering out'
Dictionary.com's 21st Century Lexicon
Copyright © 2003-2013 Dictionary.com, LLC
Cite This Source
00:10
Exfiltrate is one of our favorite verbs.
So is skedaddle. Does it mean:
to run away hurriedly; flee.
to expurgate (a written work) by removing or modifying passages considered vulgar or objectionable.
Example sentences
In badly corroded lines the sewage or wastes can exfiltrate, contaminating
  groundwater.
The water in the wetlands is allowed to infiltrate and the groundwater is
  allowed to exfiltrate into the wetland.
The infiltration capacity of the subgrade determines how much water can
  exfiltrate from the aggregate into the surrounding soils.
Pitting is highly localized corrosion causing perforations large enough to
  infiltrate or exfiltrate water.
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