[have] sticky fingers
1
to have a tendency to steal from others whenever the opportunity presents itself
The idiom "have sticky fingers" dates back to at least the early 1900s. It refers to the tendency of people's fingers to become sticky or coated after handling something adhesive or sticky - much like the fingers of a thief might become after stealing or handling stolen goods. It is used to suggest that someone is dishonest, prone to theft, or inclined to take things that do not belong to them.
- Don't leave your belongings unattended around him; he's known to have sticky fingers.
- Her habit of taking things that don't belong to her shows that she has sticky fingers.
- If he learns the value of honesty, he won't have sticky fingers in the future.
- The security team suspects that someone in the office has sticky fingers, as items keep going missing.