go back on


2 [bak]
at, to, or toward the rear; backward: to step back.
in or toward the past: to look back on one's youth; They met in Chicago back in 1976.
at or toward the original starting point, place, or condition: to go back to the old neighborhood.
in direct payment or return: to pay back a loan; to answer back.
in a state of restraint or retention: to hold back the tears; to hold back salary.
in a reclining position: to lean back; to lie back.
Verb phrases
go back on,
to be treacherous or faithless to; betray: to go back on friends.
to fail to keep; renege on: to go back on promises.
back and forth, from side to side; to and fro; from one to the other: The pendulum of the grandfather clock swung back and forth.
back yonder, Chiefly South Midland U.S. formerly; many years ago: Back yonder, when I was a boy, things were different.

1480–90; aphetic variant of aback

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
back1 (bæk)
1.  the posterior part of the human body, extending from the neck to the pelvisRelated: dorsal
2.  the corresponding or upper part of an animal
3.  the spinal column
4.  the part or side of an object opposite the front
5.  the part or side of anything less often seen or used: the back of a carpet; the back of a knife
6.  the part or side of anything that is furthest from the front or from a spectator: the back of the stage
7.  the convex part of something: the back of a hill; the back of a ship
8.  something that supports, covers, or strengthens the rear of an object
9.  ball games
 a.  a mainly defensive player behind a forward
 b.  the position of such a player
10.  the part of a book to which the pages are glued or that joins the covers
11.  mining
 a.  the side of a passage or layer nearest the surface
 b.  the earth between that level and the next
12.  Compare bed the upper surface of a joist, rafter, slate, tile, etc, when in position
13.  at one's back behind, esp in support or pursuit
14.  at the back of one's mind not in one's conscious thoughts
15.  behind one's back without one's knowledge; secretly or deceitfully
16.  break one's back to overwork or work very hard
17.  break the back of to complete the greatest or hardest part of (a task)
18.  on one's back, flat on one's back incapacitated, esp through illness
19.  informal get off someone's back to stop criticizing or pestering someone
20.  have on one's back to be burdened with
21.  informal on someone's back criticizing or pestering someone
22.  put one's back into to devote all one's strength to (a task)
23.  put someone's back up, get someone's back up to annoy someone
24.  see the back of to be rid of
25.  back of beyond
 a.  the back of beyond a very remote place
 b.  (Austral) in such a place (esp in the phrase out back of beyond)
26.  turn one's back on
 a.  to turn away from in anger or contempt
 b.  to refuse to help; abandon
27.  with one's back to the wall in a difficult or desperate situation
28.  (also intr) to move or cause to move backwards
29.  to provide support, money, or encouragement for (a person, enterprise, etc)
30.  to bet on the success of: to back a horse
31.  to provide with a back, backing, or lining
32.  to provide with a music accompaniment: a soloist backed by an orchestra
33.  to provide a background for; be at the back of: mountains back the town
34.  to countersign or endorse
35.  archaic to mount the back of
36.  (intr; foll by on or onto) to have the back facing (towards): the house backs onto a river
37.  (intr) See veer (of the wind) to change direction in an anticlockwise direction in the northern hemisphere and a clockwise direction in the southern
38.  nautical to position (a sail) so that the wind presses on its opposite side
39.  back and fill
 a.  nautical to manoeuvre the sails by alternately filling and emptying them of wind to navigate in a narrow place
 b.  to vacillate in one's opinion
40.  situated behind: a back lane
41.  of the past: back issues of a magazine
42.  owing from an earlier date: back rent
43.  chiefly (US), (Austral), (NZ) remote: back country
44.  (of a road) not direct
45.  moving in a backward direction: back current
46.  phonetics of, relating to, or denoting a vowel articulated with the tongue retracted towards the soft palate, as for the vowels in English hard, fall, hot, full, fool
47.  at, to, or towards the rear; away from something considered to be the front; backwards; behind
48.  in, to, or towards the original starting point, place, or condition: to go back home; put the book back; my headache has come back
49.  in or into the past: to look back on one's childhood
50.  in reply, repayment, or retaliation: to hit someone back; pay back a debt; to answer back
51.  in check: the dam holds back the water
52.  in concealment; in reserve: to keep something back; to hold back information
53.  back and forth to and fro
54.  back to front
 a.  in reverse
 b.  in disorder
Related: dorsal
[Old English bæc; related to Old Norse bak, Old Frisian bek, Old High German bah]

back2 (bæk)
a large tub or vat, esp one used by brewers
[C17: from Dutch bak tub, cistern, from Old French bac, from Vulgar Latin bacca (unattested) vessel for liquids]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. bæc "back, backwards, behind," from P.Gmc. *bakam (cf. O.S., M.Du. bak, O.Fris. bek), with no known connections outside Germanic. The cognates mostly have been ousted in this sense in other modern Gmc. languages by words akin to Modern English ridge (cf. Dan. ryg,
Ger. Rücken). Many I.E. languages show signs of once having distinguished the horizontal back of an animal (or a mountain range) from the upright back of a human. In other cases, a modern word for "back" may come from a word related to "spine" (It. schiena, Rus. spina) or "shoulder, shoulder blade" (Sp. espalda, Pol. plecy).

late 15c., "to move (something) back," from back (adj.); meaning "to support" (as by a bet) is first attested 1540s.

O.E. bæc "backwards, behind" (see back (n.)). Back-seat driver first attested 1926. The back of (one's) hand has been used to imply contempt and rejection since at least 1300; to know (something) like the back of one's hand, implying familiarity, is first attested 1943.
To be on the back burner in the figurative sense is from 1960, from the image of a cook keeping a pot there to simmer while he or she works on another concoction at the front of the stove. Back-to-nature (adj.) is first attested 1915.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

back (bāk)

  1. The posterior portion of the trunk of the human body between the neck and the pelvis; the dorsum.

  2. The backbone or spine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Idioms & Phrases

go back on

Fail to honor or keep, as in You can't go back on your word, or One should never go back on a promise. [Mid-1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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