tweak
vb tr
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
n
4 an instance of tweaking
5 Informal a minor alteration
(Old English twiccian; related to Old High German zwecchon; see twitch)
♦
tweaky adj