1. to cheat or swindle someone
Usage: informal
2. to waste time or move aimlessly
Usage: informal

Examples

• The mechanic tried to diddle me by charging for unnecessary repairs.
• She felt diddled when she discovered the overpriced warranty was worthless.
• Stop diddling around and get to work.
• He spent the afternoon diddling with his phone instead of studying.
• The salesman diddled the elderly couple out of their savings.
• Don’t diddle with the controls unless you know what you’re doing.