"tweak" in the noun sense
1. pinch, tweak
a squeeze with the fingers
"tweak" in the verb sense
1. tweak
pinch or squeeze sharply
2. pluck, tweak, pull off, pick off
pull or pull out sharply
"pluck the flowers off the bush"
3. fine-tune, tweak
adjust finely
"fine-tune the engine"
Source: WordNet® (An amazing lexical database of English)
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