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Definition of open up phrasal verb from the Oxford Advanced Learner's Dictionary

open up

phrasal verb
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open up
  1. to begin shooting
    • Anti-aircraft guns opened up.
  2. (often used in orders) to open a door, container, etc.
    • Open up or we'll break the door down!
    • ‘Open up!’ He hammered on the door.
open up (to somebody)
(British English also open out (to somebody))
  1. to talk about what you feel and think; to become less shy and more willing to communicate
    • It helps to discuss your problems but I find it hard to open up.
    • He only opened up to her very slowly.
open something up | open up
  1. to become or make something possible, available or able to be reached
    • The new catalogue will open up the market for our products.
    • The railway opened up the east of the country.
    • Exciting possibilities were opening up for her in the new job.
  2. to begin business for the day
    • I open up the store for the day at around 8.30.
    • I'd just opened up when this guy came in.
    opposite close up
  3. to start a new business
    • There's a new Thai restaurant opening up in town.
    • We've just opened up a branch in Madrid.
    opposite close down
  4. to develop or start to happen or exist; to develop or start something
    • A division has opened up between the two ministers over the issue.
    • Scott opened up a 3-point lead in the first game.
  5. to appear and become wider; to make something wider when it is narrow or closed
    • The wound opened up and started bleeding.
    • The operation will open up the blocked passages around his heart.
    opposite close up
open something up
  1. to make something open that is shut, locked, etc.
    • She laid the book flat and opened it up.
See open up in the Oxford Advanced American Dictionary

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