fiddle about with something

Từ điển Oxford Advanced Learner 8th

ˌfiddle aˈbout/aˈround with sth | ˈfiddle with sth derived
1. to keep touching sth or making small changes to sth because you are not satisfied with it
•I've been fiddling about with this design for ages.
2. to touch or move the parts of sth in order to try to change it or repair it
•Who's been fiddling with the TV again?
Main entry: ↑fiddle_derived