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  1. keannu's Avatar
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    opened its doors

    Why is it a plural form "doors", when "open its door" seems enough?
    Does it mean "start a business" or "open/provide information to the public"?

    ex)The first African-American director was William Foster, whose Foster Photoplay Company opened its doors in Chicago in 1910...

  2. Chicken Sandwich's Avatar
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    Re: opened its doors

    5start operating [ intransitive and transitive ] ( also open up ) if a place such as an office, shop, restaurant etc opens or is opened, it starts operating or providing a service : Sarah had recently opened an office in Genoa.
    French and Scandinavian offices are due to open in the autumn.
    The Forestry Commission has opened a plant centre selling rare plants.
    The centre has been a great success since it opened its doors a year ago.

    Source: Longman Dictionary of Contemporary English

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    Re: opened its doors

    It's idiomatic. Many businesses have more than one entry place, or at the very least double doors at the one entrance.

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