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tweak

[tweek] /twik/
verb (used with object)
1.
to pinch and pull with a jerk and twist:
to tweak someone's ear; to tweak someone's nose.
2.
to pull or pinch the nose of, especially gently:
He tweaked the baby on greeting.
3.
to make a minor adjustment to:
to tweak a computer program.
noun
4.
an act or instance of tweaking; a sharp, twisting pull or jerk.
Origin
1595-1605
1595-1605; akin to twitch
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for tweaks

tweak

/twiːk/
verb (transitive)
1.
to twist, jerk, or pinch with a sharp or sudden movement: to tweak someone's nose
2.
(motor racing, slang) to tune (a car or engine) for peak performance
3.
(informal) to make a minor alteration
noun
4.
an instance of tweaking
5.
(informal) a minor alteration
Derived Forms
tweaky, adjective
Word Origin
Old English twiccian; related to Old High German zwecchōn; see twitch
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 tweaks

tweak

v.

"pinch, pluck, twist," usually to the nose, probably from Old English twiccian "to pluck," of obscure origin; perhaps related to twitch. Meaning "to make fine adjustments" is attested from 1966. Related: Tweaked; tweaking. The noun in this sense is recorded by 1989.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for tweaks

twaddle

noun

Idle talk; blathering (1782+)


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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