if you have nothing to do, you are likely to do some mischief
an idle person is likely to do something evil
people are more likely to do something bad and get into trouble when they have nothing to do
All the kids should be kept busy while you are away; idle hands are the devil’s tools.
I don’t like the look the man standing outside doing nothing. Idle hands are the devil’s tools.
We should find something useful for Amy to do during the afternoon. Idle hands are the devil’s tools.
Why are you wasting your time doing nothing? Don’t you know, idle hands are the devil’s tools.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.