exfiltrate

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

Origin:
1965–70; ex-1 + (in)filtrate

exfiltration, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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 © 2003-2014 Dictionary.com, LLC
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Example sentences
The infiltration capacity of the subgrade determines how much water can
  exfiltrate from the aggregate into the surrounding soils.
Usually, individuals had to exfiltrate enemy territory by hazardous land routes.
Envelope cracks above this plane exfiltrate and openings below infiltrate.
The water in the wetlands is allowed to infiltrate and the groundwater is
  allowed to exfiltrate into the wetland.
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