Idiom
fool with somethingfool with (something)
1.
to be busy with something without a special purpose.
Sammy was always fooling with his model trains.
2.
to try to fix or use something complicated.
I'm not an expert, but I've spent 14 years fooling with computers and thought I could handle this problem.Don't fool with those papers! I've got them in a particular order.
Usage notes: usually if you fool with something, you will spoil or break it
Related vocabulary: mess with something, fuss with something