Caught with their hands in the cookie jar In english explanation

Since the British use the term biscuit instead of cookie, and there is no equivalent British language, this idiom is mostly North American. A cookie jar made of ceramic or other material has long been a tradition in American households, and children are normally not allowed to open it until they are granted permission.Children are often captured with their hand in the cookie jar by their parents because cookies are addictive. This aspect of American culture, along with the fact that both treats and wealth are enticing, led to the term being applied to refer to money theft as well as more general applications.