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tweak (v.)

"pinch, pluck, twist," usually to the nose, c. 1600, probably from Middle English twikken "to draw, tug, pluck" (mid-15c.), 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.

tweak (n.)

c. 1600, "a twitch, a pluck," from tweak (v.). As "a fine adjustment" by 1989.

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Definitions of tweak from WordNet
1
tweak (v.)
pinch or squeeze sharply;
tweak (v.)
pull or pull out sharply;
Synonyms: pluck / pull off / pick off
tweak (v.)
adjust finely;
Synonyms: fine-tune
2
tweak (n.)
a squeeze with the fingers;
Synonyms: pinch
From wordnet.princeton.edu