fool with (someone or something)
1. To play or tinker with something, often in an aimless manner. Hey, don't fool with the thermostat—it needs to stay at 68 degrees. Grandpa's still fooling with that old radio, but I doubt he'll get it to work again.
2. To engage in aimless recreation or frivolous time-wasting with someone or something. Quit fooling with the dog and work on your book report already!
3. To tease or mock someone. Sarah's a very sensitive kid, so don't fool with her.
4. To menace or bully someone. If you keep fooling with me, you're going to get a punch in the nose!
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!
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.