American English

Definition of open adjective from the Oxford Advanced American Dictionary



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    not closed
  1. 1allowing things or people to go through A wasp flew in the open window. She had left the door wide open. The door flew open and the children rushed in. opposite closed
  2. 2(of someone's eyes, mouth, etc.) with eyelids or lips apart She had difficulty keeping her eyes open (= because she was very tired). He was breathing through his open mouth. opposite closed
  3. 3spread out; with the edges apart The flowers are all open now. The book lay open on the table. opposite closed
  4. 4not blocked by anything The mountain pass is kept open year-round. opposite closed
  5. not fastened
  6. 5not fastened or covered, so that things can easily come out or be put in Leave the envelope open. The bag burst open and everything fell out.
  7. 6(of clothes) not fastened Her coat was open.
  8. not enclosed
  9. 7not surrounded by anything; not closed in open country (= without forests, buildings, etc.) a city with a lot of parks and open spaces driving along the open road (= part of a road in the country, where you can drive fast)
  10. not covered
  11. 8with no cover or roof on an open drain people working in the open air (= not in a building) The building's interior courtyard was open to the sky. an open wound (= with no skin covering it) an open flame
  12. for customers/visitors
  13. 9[not usually before noun] if a store, bank, business, etc. is open, it is ready for business and will admit customers or visitors Is the museum open on Sundays? The new store will be open in the spring. The house was thrown open to the public. I declare this festival open. opposite closed
  14. of competition/building
  15. 10if a competition, etc. is open, anyone can enter it synonym public an open debate/championship/scholarship She was tried in open court (= the public could go and listen to the trial). The debate was thrown open to the audience.
  16. 11[not before noun] open to somebody if a competition, building, etc. is open to particular people, those people can enter it The competition is open to young people under the age of 18. The house is not open to the public. opposite closed
  17. available
  18. 12[not before noun] open (to somebody) to be available and ready to use What options are open to us? Is the offer still open? I want to keep my savings account open. opposite closed
  19. not protected
  20. 13open (to something) likely to suffer something such as criticism, injury, etc. synonym vulnerable The system is open to abuse. He laid himself wide open to political attack. Kasparov had left his bishop open (= not protected, in a game of chess ).
  21. not hidden
  22. 14known to everyone; not kept hidden an open quarrel open government their open display of affection His eyes showed open admiration as he looked at her.
  23. person's character
  24. 15honest; not keeping thoughts and feelings hidden synonym frank She was always open with her parents. He was quite open about his reasons for leaving. Thesaurushonestdirect open outspoken straight blunt frankThese words all describe people saying exactly what they mean without trying to hide feelings, opinions, or facts.honest not hiding the truth about something:Thank you for being so honest with saying exactly what you mean in a way that nobody can pretend not to understand:You'll have to get used to his direct manner. Being direct is sometimes considered positive but sometimes it is used as a “polite” way of saying that someone is (approving) (of a person) not keeping thoughts and feelings hidden:He was quite open about his reasons for leaving.outspoken saying exactly what you think, even if this shocks or offends people:She was outspoken in her criticism of the plan.straight honest and direct:I don't think you're being straight with me.blunt saying exactly what you think without trying to be polite:She has a reputation for being blunt.frank (somewhat formal) honest in what you say, sometimes in a way that other people might not like:To be frank with you, I think your son has little chance of passing the exam.which word?Honest and frank refer to what you say as much as how you say it:a(n) honest/frank admission of guilt. They are generally positive words, although it is possible to be too frank in a way that other people might not like. Direct, outspoken, and blunt all describe someone's manner of saying what they think. Outspoken suggests that you are willing to shock people by saying what you believe to be right. Blunt and direct often suggest that you think honesty is more important than being polite. Open is positive and describes someone's character:I'm a very open person.Patterns honest/direct/open/outspoken/straight/frank about something honest/direct/open/straight/blunt/frank with somebody a(n) honest/direct/straight/blunt answer a direct/blunt/frank manner
  25. 16open to something (of a person) willing to listen to and think about new ideas I'm open to suggestions for what you would like to do in our classes.
  26. not yet decided
  27. 17open (to something) not yet finally decided or settled The race is still wide open (= anyone could win). The price is not open to negotiation. Some phrases in the contract are open to interpretation. Which route is better remains an open question (= it is not decided). In an interview try to ask open questions (= to which the answer is not just “yes” or “no”).
  28. cloth
  29. 18with wide spaces between the threads an open weave
  30. phonetics
  31. 19(also low) (of a vowel) produced by opening the mouth wide compare close1
  32. Idioms
    burst open, burst (something) open
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    to open suddenly or violently; to make something open in this way The door burst open. Firefighters burst the door open and rescued them.
    (open) the door to something
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    (to provide) the means of getting or reaching something; (to create) the opportunity for something The agreement will open the door to increased international trade. Our courses are the door to success in English.
    have/keep an open mind (about/on something)
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    to be willing to listen to or accept new ideas or suggestions
    keep your ears/eyes open (for something)
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    to be quick to notice or hear things
    keep/leave your options open
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    to avoid making a decision now so that you still have a choice in the future For now, I'm keeping my options open and applying for as many different jobs as possible.
    on the open market
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    available to buy without any restrictions
    an open book
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    if you describe someone or their life as an open book, you mean that you can easily understand them and know everything about them
      an open invitation (to somebody)
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    1. 1an invitation to someone to visit you at any time
    2. 2if something is an open invitation to criminals, etc., it encourages them to commit a crime by making it easier Leaving your camera on the seat of the car is an open invitation to thieves.
    an open secret
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    if something is an open secret, many people know about it, although it is supposed to be a secret
    with your eyes open
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    fully aware of the possible problems or results of a particular course of action I went into this with my eyes open so I guess I only have myself to blame.
    with open arms
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    if you welcome someone with open arms, you are extremely happy and pleased to see them
See the Oxford Advanced Learner's Dictionary entry: open