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verb British English pronunciation: open /ˈəʊpən/ 
Word Forms
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present tense
I/you/we/theyopen
he/she/itopens
present participleopening
past tenseopened
past participleopened
  1. 1
    [transitive] to separate the edges of something, or to take off its cover so that you can see or remove what is inside

    She opened her shopping bag and took out an umbrella.

    Can you open this jam jar?

    Open your books at page 25.

  2. 2
    [transitive] to move a door or window into a position that allows people or things to pass through

    Do you mind if I open a window?

    The school gates are opened at 8.45.

    1. a.
      [intransitive] if something such as a door opens, it moves into a position that allows people or things to pass through

      The lift doors opened and two men walked out.

      open onto/into something:

      The kitchen door opens onto a patio.

  3. 4
    [intransitive/transitive] if a shop, public building etc opens at a particular time, or if someone opens it, it regularly becomes available for people to visit or use at that time

    The library doesn't open till 9.30.

    I'm calling to ask when you open today.

  4. 5

    open

    or

    open up

    [intransitive/transitive] if a new business, building etc opens, or if someone opens it, it becomes available for people to use for the first time

    They decided to move to Spain and open a bar.

    The college first opened in the 1960s.

    1. a.
      [intransitive/transitive] if something that has been private or secret opens, or if someone opens it to people, it becomes available for people to visit, see, or take part in
      open something to someone:

      There are plans to open the gardens to the public.

      open something to competition/inspection/scrutiny:

      The telecommunications market has been opened up to competition.

      open your doors/gates to someone:

      The farmer opens his gates to visitors during the lambing season.

    2. b.
      [intransitive] theatre, cinema if a film or play opens, it starts being shown to the public

      Her new play has just opened on Broadway.

    3. c.
      [intransitive/transitive] if a road, telephone line, or other method of communication opens, or if someone opens it, it becomes available for people to use

      We are opening a hotline for enquiries about the product.

  5. 6
    [transitive] to begin something such as a discussion or trial

    She opened the debate by summarizing her party's position.

    open an investigation/inquiry/inquest:

    The police have opened an investigation into his business affairs.

    1. a.
      [intransitive] to begin a speech
      open with:

      He opened his talk with a quotation from Shakespeare.

    2. b.
      [transitive] to start an account with a bank

      You only need £1 to open an account with us.

    3. c.
      [intransitive] when a period of time opens, it begins

      The year opened well for the company.

      The trout fishing season opened last week.

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