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fiddle with (something)
To play or toy with something, often in a aimless manner. Hey, don't fiddle around with the thermostat—it needs to stay at 65 degrees. Grandpa's still fiddling around with that old radio, but I doubt he'll get it to work again.
fiddle with someone or something
to tinker or play with someone or something. Please don't fiddle with the stereo controls. Leave your brother alone. Don't fiddle with him. He's cranky.
1. To make unskilled or experimental efforts at repairing or improving something: I fiddled with the broken toaster, but I couldn't fix it.
2. To manipulate something without a clear sense of purpose: Stop fiddling with the remote or you'll break it.