Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: twiccian 'to pull out'

tweak

 verb
     
tweak [transitive]
1 to suddenly pull or twist something:
She leant forward and tweaked both ends of his moustache.
2 to make small changes to a machine, vehicle, or system in order to improve the way it works:
Maybe you should tweak a few sentences before you send in the report.
—tweak noun [countable usually singular]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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