open door
noun/ˌəʊpən ˈdɔː(r)/
/ˌəʊpən ˈdɔːr/
[singular]- 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.
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open door