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[troo] /tru/
adjective, truer, truest.
being in accordance with the actual state or conditions; conforming to reality or fact; not false:
a true story.
real; genuine; authentic:
true gold; true feelings.
sincere; not deceitful:
a true interest in someone's welfare.
firm in allegiance; loyal; faithful; steadfast:
a true friend.
being or reflecting the essential or genuine character of something:
the true meaning of his statement.
conforming to or consistent with a standard, pattern, or the like:
a true copy.
exact; precise; accurate; correct:
a true balance.
of the right kind; such as it should be; proper:
to arrange things in their true order.
properly so called; rightly answering to a description:
true statesmanship.
legitimate or rightful:
the true heir.
reliable, unfailing, or sure:
a true sign.
exactly or accurately shaped, formed, fitted, or placed, as a surface, instrument, or part of a mechanism.
honest; honorable; upright.
Biology. conforming to the type, norm, or standard of structure of a particular group; typical:
The lion is a true cat.
Animal Husbandry, purebred.
Navigation. (of a bearing, course, etc.) determined in relation to true north.
Archaic. truthful.
exact or accurate formation, position, or adjustment:
to be out of true.
the true, something that is true; truth.
in a true manner; truly; truthfully.
exactly or accurately.
in conformity with the ancestral type:
to breed true.
verb (used with object), trued, truing or trueing.
to make true; shape, adjust, place, etc., exactly or accurately:
to true the wheels of a bicycle after striking a pothole.
(especially in carpentry) to make even, symmetrical, level, etc. (often followed by up):
to true up the sides of a door.
come true, to have the expected or hoped-for result; become a reality:
She couldn't believe that her dream would ever come true.
Origin of true
before 900; Middle English trewe (adj. and adv.), Old English trēowe (adj.) loyal, trusty, honest (see trow, truce); akin to Dutch trouw, German treu, Old Norse tryggr, Gothic triggws
Related forms
trueness, noun
half-true, adjective
1. factual, veracious. See real1 . 3. honest. 4. trustworthy; staunch, constant, steady, unwavering. 7. faithful. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for true up
Historical Examples
  • Bronze cannon, however, could be put in the lathes to true up even the exterior.

  • Double-ended cutter n is then fed through the hub of the pulley to true up the cored hole.

    Turning and Boring Franklin D. Jones
  • This is true up to the point where the magnitude of the whole becomes so great as to render the conducting of it difficult.

  • After the sawing is completed, a file is used to true up the outline and to smooth the edges.

    Copper Work Augustus F. Rose
  • About all that remains now to be done is to true up the balance and bring it to poise.

  • Neither Dickens nor Hardy can be called unveracious writers; both give a picture of life that is true up to a point.

  • It is not difficult to true up the crank-pins or main journals if the score marks are not deep.

    Aviation Engines Victor Wilfred Pag
  • This is true up to a certain point, but when the limit has been passed, the muscle quickly fails to respond.

    A Practical Physiology Albert F. Blaisdell
  • The old sneider carbine, though laughed at nowadays, was true up to 300 yards, and the Maori was not more than 200 yards from me.

  • To true up and smooth the outside of the wheel the lathe attachment as shown in Fig. 28 can be easily prepared.

British Dictionary definitions for true up


adjective truer, truest
not false, fictional, or illusory; factual or factually accurate; conforming with reality
(prenominal) being of real or natural origin; genuine; not synthetic: true leather
  1. unswervingly faithful and loyal to friends, a cause, etc: a true follower
  2. (as collective noun; preceded by the): the loyal and the true
faithful to a particular concept of truth, esp of religious truth: a true believer
conforming to a required standard, law, or pattern: a true aim, a true fit
exactly in tune: a true note
(of a compass bearing) according to the earth's geographical rather than magnetic poles: true north
(biology) conforming to the typical structure of a designated type: sphagnum moss is a true moss, Spanish moss is not
(physics) not apparent or relative; taking into account all complicating factors: the true expansion of a liquid takes into account the expansion of the container Compare apparent (sense 3)
(informal) not true, unbelievable; remarkable: she's got so much money it's not true
true to life, exactly comparable with reality
correct alignment (esp in the phrases in true, out of true)
truthfully; rightly
precisely or unswervingly: he shot true
(biology) without variation from the ancestral type: to breed true
verb trues, truing, trued
(transitive) to adjust so as to make true
Derived Forms
trueness, noun
Word Origin
Old English triewe; related to Old Frisian triūwe, Old Saxon, Old High German triuwi loyal, Old Norse tryggr; see trow, trust
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for true up



Old English triewe (West Saxon), treowe (Mercian) "faithful, trustworthy," from Proto-Germanic *trewwjaz "having or characterized by good faith" (cf. Old Frisian triuwi, Dutch getrouw, Old High German gatriuwu, German treu, Old Norse tryggr, Gothic triggws "faithful, trusty"), perhaps ultimately from PIE *dru- "tree," on the notion of "steadfast as an oak." Cf., from same root, Lithuanian drutas "firm," Welsh drud, Old Irish dron "strong," Welsh derw "true," Old Irish derb "sure."

Sense of "consistent with fact" first recorded c.1200; that of "real, genuine, not counterfeit" is from late 14c.; that of "agreeing with a certain standard" (as true north) is from c.1550. Of artifacts, "accurately fitted or shaped" it is recorded from late 15c.; the verb in this sense is from 1841. True-love (adj.) is recorded from late 15c.; true-born first attested 1590s. True-false as a type of test question is recorded from 1923.

Online Etymology Dictionary, © 2010 Douglas Harper
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Idioms and Phrases with true up
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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