tweak

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tweak /tw'iːk/ (tweaks tweaking tweaked)
1 [VERB] V n
If you tweak something, especially part of someone's body, you hold it between your finger and thumb and twist it or pull it.
He tweaked Guy's ear roughly...
2 [VERB] V n
If you tweak something such as a system or a design, you improve it by making a slight change. (INFORMAL)
He expects the system to get even better as the engineers tweak its performance.
[N-COUNT]
Tweak is also a noun.
The camera has undergone only two minor tweaks since its introduction.

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