catch someone with their hand in the cookie jar

catch someone with their hand in the cookie jar

AMERICAN
If you catch someone with their hand in the cookie jar, you find them doing something wrong, especially stealing. The banker was caught with his hand in the cookie jar. So Harry caught you with your hand in the cookie jar? What happened next? Note: You can also talk about a person with their hand in the cookie jar or say that they have their hand in the cookie jar. Among those with their hand in the cookie jar was, it is alleged, the director of the program. Note: The usual British expression is have your hand in the till.
See also: catch, cookie, hand, jar