noun, noun which may take the genitive case particle 'no'
open door policy
A yojijukugo referring to a policy of openness, especially in international relations or trade, where a country opens its doors to foreign interaction.
At the end of the 19th century, the United States advocated an open door policy toward China.
This company welcomes applications from overseas in the spirit of an open door policy.
開放 means 'opening' or 'liberalization' in general, while 門戸開放 specifically refers to an open door policy, often in a diplomatic or institutional context.
open door policy
A yojijukugo composed of 門戸 (door, gateway) and 開放 (opening, liberalization). The term is a direct translation of the English 'open door policy' and became common in Japanese diplomatic language in the late 19th and early 20th centuries.