fiddle

manipulate manually or in one's mind or imagination

“Don't fiddle with the screws”

bowed stringed instrument that is the highest member of the violin family; this instrument has four strings and a hollow body and an unfretted fingerboard and is played with a bow

play around with or alter or falsify, usually secretively or dishonestly

“The reporter fiddle with the facts”

try to fix or mend

“She always fiddles with her van on the weekend”

avoid (one's assigned duties)

commit fraud and steal from one's employer

play on a violin

“Zuckerman fiddled that song very nicely”

play the violin or fiddle