Longman Dictionary of Contemporary English homepage

tinker

1 verb
     
tin‧ker1 [intransitive]
to make small changes to something in order to repair it or make it work better
tinker with
Congress has been tinkering with the legislation.
tinker around with something
Dad was always tinkering around with engines.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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