| 1. | the rear part of the human body, extending from the neck to the lower end of the spine. |
| 2. | the part of the body of animals corresponding to the human back. |
| 3. | the rear portion of any part of the body: the back of the head. |
| 4. | the whole body, with reference to clothing: the clothes on his back. |
| 5. | ability for labor; effort; endurance: He put his back into the task. |
| 6. | the part opposite to or farthest from the front; the rear part: the back of a hall. |
| 7. | the part that forms the rear of any object or structure: the back of a chair. |
| 8. | the part that covers the back: the back of a jacket. |
| 9. | the spine or backbone: The fall broke his back. |
| 10. | any rear part of an object serving to support, protect, etc.: the back of a binder. |
| 11. | Nautical, Aeronautics. the forward side of a propeller blade (opposed to face ). |
| 12. | Aeronautics. the top part or upper surface of an aircraft, esp. of its fuselage. |
| 13. | Bookbinding. the edge of a book formed where its sections are bound together. |
| 14. | the backs, grounds along the River Cam in back of certain colleges at Cambridge University in England: noted for their great beauty. |
| 15. | Architecture. extrados. |
| 16. | Carpentry.
|
| 17. | Mining. the roof of a stope or drift. |
| 18. | Sports.
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| 19. | to support, as with authority, influence, help, or money (often fol. by up): to back a candidate; to back up a theory with facts. |
| 20. | to bet on: to back a horse in the race. |
| 21. | to cause to move backward (often fol. by up): to back a car. |
| 22. | to furnish with a back: to back a book. |
| 23. | to lie at the back of; form a back or background for: a beach backed by hills. |
| 24. | to provide with an accompaniment: a singer backed by piano and bass. |
| 25. | to get upon the back of; mount. |
| 26. | to write or print on the back of; endorse; countersign. |
| 27. | Carpentry. to attach strips of wood to the upper edge of (a joist or rafter) to bring it to a desired level. |
| 28. | Nautical.
|
| 29. | to go or move backward (often fol. by up). |
| 30. | Nautical. (of wind) to change direction counterclockwise (opposed to veer ). |
| 31. | situated at or in the rear: at the back door; back fence. |
| 32. | far away or removed from the front or main area, position, or rank; remote: back settlements. |
| 33. | belonging to the past: back files; back issues. |
| 34. | in arrears; overdue: back pay. |
| 35. | coming or going back; moving backward: back current. |
| 36. | Navigation. reciprocal (def. 7). |
| 37. | Phonetics. (of a speech sound) produced with the tongue articulating in the back part of the mouth, as in either of the sounds of go. |
| 38. | back away, to retreat; withdraw: They gradually began to back away from their earlier opinion. |
| 39. | back down, to abandon an argument, opinion, or claim; withdraw; retreat: He backed down as soon as a member of the audience challenged his assertion. |
| 40. | back off,
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| 41. | back out or out of, to fail to keep an engagement or promise; withdraw from; abandon: Two entrants have backed out of competing in the marathon. You can't back out now. |
| 42. | back up,
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| 43. | back up for, Australian Informal. to return for more of, as another helping of food. |
| 44. | back and fill,
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| 45. | back and forth, South Midland U.S.
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| 46. | back water,
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| 47. | be flat on one's back,
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| 48. | behind one's back, in one's absence; without one's knowledge; treacherously; secretly: I'd rather talk to him about it directly than discuss it behind his back. |
| 49. | break someone's back, to cause a person to fail, esp. to cause to become bankrupt: His family's extravagance is breaking his back. |
| 50. | break the back of,
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| 51. | get off one's back, Informal. to cease to find fault with or to disturb someone: The fight started when they wouldn't get off my back. |
| 52. | get one's back up, Informal. to become annoyed; take offense: She gets her back up whenever someone mentions her family's influence. |
| 53. | have one's back to the wall, to be in a difficult or hopeless situation. |
| 54. | in back of, behind: He hid in back of the billboard. What could be in back of his strange behavior? Also, back of. |
| 55. | on one's back, Informal. finding fault with or disturbing someone: The boss is always on my back about promptness. |
| 56. | pat on the back. pat 1 (defs. 9, 8). |
| 57. | stab in the back. stab (def. 13). |
| 58. | turn one's back on,
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back 1 (bāk) n.
v. tr.
back awayTo withdraw from a position; retreat. back downTo withdraw from a position, opinion, or commitment. back offTo retreat or draw away. back out
Idiom(s): back and fill
Idiom(s): back to backConsecutively and without interruption: presented three speeches back to back. Idiom(s): behind (one's) backIn one's absence or without one's knowledge. Idiom(s): have (one's) back upTo be angry or irritated. Idiom(s): off (someone's) backNo longer nagging or urging someone to do something. Idiom(s): on (someone's) backPersistently nagging or urging someone to do something. [Middle English bak, from Old English bæc.] back'less adj. |
back
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back (bāk)
n.
The posterior portion of the trunk of the human body between the neck and the pelvis; the dorsum.
The backbone or spine.
back and fill
Vacillate, be undecided, as in This measure will never be passed if the town meeting continues to back and fill. This term comes from sailing ships, where it signifies alternately backing and filling the sails, a method used when the wind is running against a ship in a narrow channel. The sail is hauled back against the wind and braced so that the tide or current carries the ship forward against the wind. Then the sail must be swung around and filled, to keep the ship on course. The term's figurative use for indecisiveness dates from the mid-1800s.