open door

the policy of admitting people of all nationalities or ethnic groups to a country upon equal terms, as for immigration.

the policy or practice of trading with all nations on an equal basis.

admission or access; unrestricted opportunity: His experience had given him an open door to success in his field.

Origin of open door

First recorded in 1520–30

o·pen-door, adjective

He insists the company has a complete “open-door policy,” allowing any worker to bring any concern to any manager.

Walmart Protesters Tell One Story, and Employees Tell Another |Winston Ross |September 5, 2013 |DAILY BEAST
“I took full advantage of his open-door policy to seek insight and share perspectives,” she writes in the book.

Paula Broadwell, David Petraeus’s Biographer, Is Allegedly His Mistress |Isabel Wilkinson |November 10, 2012 |DAILY BEAST
Our open-door policy will continue, so I would envisage more member states than today.

How War Tests the Allies |Richard Wolffe |February 23, 2010 |DAILY BEAST
We have disputes on Georgia, or our open-door policy, and that will continue.

How War Tests the Allies |Richard Wolffe |February 23, 2010 |DAILY BEAST

Europe has no open-door policy, be it known; all doors are always shut.

A Woman's Will |Anne Warner
(a) All the nations represented at the conference have formally agreed to the open-door policy in China.

Christianity and Problems of To-day: Lectures Delivered Before Lake Forest College on the Foundation of the Late William Bross |John Huston Finley
Canning, George, attempts to join England in her open-door policy, 58.

Defenseless America |Hudson Maxim
In fact, we want an open-door policy, and a means of providing for the future of our children.

Lorimer of the Northwest |Harold Bindloss

open door

a policy or practice by which a nation grants opportunities for trade to all other nations equally

free and unrestricted admission

open to all; accessible

(in industrial relations) designating a policy of management being prepared to talk to workers in the office at any time