escape hatch

noun
1.
a hatch used for emergency escape, as from a submarine or aircraft.
2.
a means of avoiding a troublesome situation; a ready or handy way out.

Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
escape hatch
 
n
a means of escape in an emergency, esp from a submarine

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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Example sentences
If you look closely, you can see that the cap at the bottom has been chewed
  through to form a little escape hatch.
For some students email is an escape hatch, if they can't get the answer fast
  enough they email me for the answer.
It had three well-worn entrance holes, two on one side of this ancient termite
  mound with an escape hatch out the back.
Also in here was a secret escape hatch the king could use in case of trouble.
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