World English Dictionary
tweak (twiːk)
1.  to twist, jerk, or pinch with a sharp or sudden movement: to tweak someone's nose
2.  slang motor racing to tune (a car or engine) for peak performance
3.  informal to make a minor alteration
4.  an instance of tweaking
5.  informal a minor alteration
[Old English twiccian; related to Old High German zwecchōn; see twitch]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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