open door

noun
1.
the policy of admitting people of all nationalities or ethnic groups to a country upon equal terms, as for immigration.
2.
the policy or practice of trading with all nations on an equal basis.
3.
admission or access; unrestricted opportunity: His experience had given him an open door to success in his field.

Origin:
1520–30

open-door, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
open door
 
n
1.  a policy or practice by which a nation grants opportunities for trade to all other nations equally
2.  free and unrestricted admission
 
adj
3.  open to all; accessible
4.  (in industrial relations) designating a policy of management being prepared to talk to workers in the office at any time

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Both the open door and the shut door are present simultaneously.
We give them free admission through our open door into the largest and best
  market in the whole world.
We have also received flat rejections with no open door for a resubmission.
It was altogether charming, but the prettiest thing of all was a little maiden
  standing at the open door of the castle.
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