Synonym: bare, begin, disclose, establish, expose, initiate, launch, originate, reveal, show, start, uncover, unfold. Antonym: close, shut. Similar words: openly, opening, in the open, spend, opera, hope, cope, pencil. Meaning: ['əʊpən] 
n. 1. a clear or unobstructed space or expanse of land or water 2. where the air is unconfined 3. a tournament in which both professionals and amateurs may play 4. information that has become public. v. 1. cause to open or to become open 2. start to operate or function or cause to start operating or functioning 3. become open 4. begin or set in action, of meetings, speeches, recitals, etc. 5. spread out or open from a closed or folded state 6. make available 7. become available 8. have an opening or passage or outlet 9. make the opening move 10. afford access to 11. display the contents of a file or start an application as on a computer. adj. 1. affording unobstructed entrance and exit; not shut or closed 2. affording free passage or access 3. with no protection or shield 4. open to or in view of all 5. used of mouth or eyes 6. not having been filled 7. accessible to all 8. not defended or capable of being defended 9. (of textures) full of small openings or gaps 10. having no protecting cover or enclosure 11. (set theory) of an interval that contains neither of its endpoints 12. not brought to a conclusion; subject to further thought 13. not sealed or having been unsealed 14. without undue constriction as from e.g. tenseness or inhibition 15. ready or willing to receive favorably 16. open and observable; not secret or hidden 17. not requiring union membership 18. possibly accepting or permitting 19. affording free passage or view 20. openly straightforward and direct without reserve or secretiveness 21. ready for business.
n. 1. a clear or unobstructed space or expanse of land or water 2. where the air is unconfined 3. a tournament in which both professionals and amateurs may play 4. information that has become public. v. 1. cause to open or to become open 2. start to operate or function or cause to start operating or functioning 3. become open 4. begin or set in action, of meetings, speeches, recitals, etc. 5. spread out or open from a closed or folded state 6. make available 7. become available 8. have an opening or passage or outlet 9. make the opening move 10. afford access to 11. display the contents of a file or start an application as on a computer. adj. 1. affording unobstructed entrance and exit; not shut or closed 2. affording free passage or access 3. with no protection or shield 4. open to or in view of all 5. used of mouth or eyes 6. not having been filled 7. accessible to all 8. not defended or capable of being defended 9. (of textures) full of small openings or gaps 10. having no protecting cover or enclosure 11. (set theory) of an interval that contains neither of its endpoints 12. not brought to a conclusion; subject to further thought 13. not sealed or having been unsealed 14. without undue constriction as from e.g. tenseness or inhibition 15. ready or willing to receive favorably 16. open and observable; not secret or hidden 17. not requiring union membership 18. possibly accepting or permitting 19. affording free passage or view 20. openly straightforward and direct without reserve or secretiveness 21. ready for business. 
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31. The curtains were flapping at the open window.
32. An icy wind blew hard across the open spaces.
33. His theories are open to dispute .
34. Music blared out from the open window.
35. The doors open and close automatically.
36. A wasp flew in the open window.
37. There was open hostility between the two schools.
38. We need to open up overseas markets.
39. Turn the door knob to open the door.
40. He closed his eyes but his mouth remained open.
41. When is the post office open?
42. The ship steered for the open seas.
43. The restaurant is open every day except Monday.
44. The door was suddenly flung open.
45. At Christmas the stores stay open late.
46. The best way to open it is with pliers.
47. Tug the drawer and it will open.
48. They eyed each other with open hostility.
49. She had left the door wide open.
50. Firearms are not freely available on the open market.
51. The doors open and shut automatically.
52. The door flew open and the children rushed in.
53. She flung open the window and inhaled deeply.
53. Sentencedict.com try its best to gather and make good sentences.
54. You must use force to open that bottle.
55. The door flew open and she rushed in.
56. His shirt gapes open with a button missing.
57. The legal system is open to abuse.
58. Why are these milk cartons so difficult to open?
59. Can I open a window? It's boiling in here.
60. Take exercise in the open air.