muck about with something

Từ điển Oxford Advanced Learner 8th

ˌmuck aˈbout/aˈround with sth derived
(BrE, informal, disapproving)to do sth, especially to a machine, so that it does not work correctly
Syn: ↑mess about
•Who's mucking around with my radio?
Main entry: ↑muck_derived