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Definition of open door noun from the Oxford Advanced Learner's Dictionary

open door

noun
 
/ˌəʊpən ˈdɔː(r)/
 
/ˌəʊpən ˈdɔːr/
[singular]
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  1. open door (to something/somebody) a situation that allows something to happen, or that allows people to go to a place or get information without controls or limits
    • The government's policy is an open door to disaster.
    • An insecure computer system is an open door to criminals.
See open door in the Oxford Advanced American Dictionary
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