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


open door

BrE BrE//ˌəʊpən ˈdɔː(r)//
; NAmE NAmE//ˌoʊpən ˈdɔːr//
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[singular] a situation that allows something to happen, or that allows people to go to a place or get information without restrictions The government's policy is an open door to disaster. An insecure computer system is an open door to criminals.
See the Oxford Advanced American Dictionary entry: open door