1. wasting time or moving aimlessly without purpose
Usage: informal
2. playing with or manipulating something in a casual way
Usage: informal
3. cheating or swindling someone
Usage: informal

Examples

• Stop diddling around and get to work.
• He was diddling with the radio knobs trying to find a clear station.
• She spent the morning diddling in the garden.
• The mechanic was diddling with the engine for hours.
• They accused him of diddling customers out of their money.
• Quit diddling and focus on the task at hand.