open its doors
open its doors {v. phr.}
1. To allow someone or something to enter or join; become open.
That college was started for women only, but a few years ago it opened its doors to men.
2. To begin doing business; open.
Proffitts Department Store is having a birthday sale; it first opened its doors fifty years ago this month.
Contrast: CLOSE ITS DOORS.
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Source: A Dictionary of American Idioms