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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1. At open doors dogs come in. 
2. An open enemy is better than a hollow friend.
3. False friends are worse than open enemies.
4. Keep your mouth shut and your eyes open.
5. Better an open enemy than a false friend.
6. Open confession is good for the soul.
7. Keep your mouth shut and your ears open.
8. Open not your door when the devil knocks.
9. A golden key can open any door.
10. A bad bush is better than the open field.
11. An open door may tempt a saint.
12. It is easy to open a shop but hard to keep it always open.
13. Keep your eyes wide open before marriage, and half shut afterwards.
14. A man without a smiling face must not open a shop.
15. A wooer should open his ears more than his eyes.
16. We slept under the open sky.
17. Her eyelids fluttered but did not open.
18. Pull this lever to open the gate.
19. The canal is open to shipping.
20. The museum is open to the public.
21. Our office is open from Monday to Friday inclusive.
22. They used brute force to break open the door.
23. I was forced to open the door.
24. Is it all right if I open the window?
25. The competition has been thrown open to the public.
26. She had fallen and cut her head open.
27. The library is open every day.
28. Several avenues are open to us.
29. He slit open the envelope with a knife.
30. The museum is open all year round .