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.

noun

1. a policy or practice by which a nation grants opportunities for trade to all other nations equally
2. free and unrestricted admission

adjective open-door

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