American English

Definition of open up phrasal verb from the Oxford Advanced American Dictionary

 

open up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to talk about what you feel and think It helps to discuss your problems but I find it hard to open up.
  2. 2to begin shooting Anti-aircraft guns opened up.
  3. 3(often used in orders) to open a door, container, etc. Open up or we'll break the door down!

    open somethingup

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    open up

     
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  1. 1 to become or make something possible, available, or able to be reached The new catalog will open up the market for our products. The transcontinental railroad opened up the American West. Exciting possibilities were opening up for her in the new job.
  2. 2 to begin business for the day; to start a new business I open up the store for the day at 9. opposite close up
  3. 3to start a new business There's a new Thai restaurant opening up in town. opposite close down
  4. 4 to develop or start to happen or exist; to develop or start something A division has opened up between the two senators over the issue. Scott opened up a 3-point lead in the first game.
  5. 5to 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 somethingup

 
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to make something open that is shut, locked, etc. She laid the book flat and opened it up.
See the Oxford Advanced Learner's Dictionary entry: open up