fool with

fool (around) with someone or something

 
1. to waste time in the company of someone or a group. Stop fooling around with those guys. They're up to no good most of the time. Better not fool around with part-time work. Go get a good job if you can.
2. to have dealings with or tamper with someone or something. You had better not fool around with my little sister. Don't fool with that thing!
3. to challenge or threaten someone or something. You had better not fool around with me, if you know what's good for you. Don't fool with the police force!
See also: fool

fool with

v.
1. To alter something improperly: Did someone fool with the computer settings?
2. To tease someone: Don't mind your uncle—he's just fooling with you.
See also: fool
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