Keystone Cops, the
From Longman Dictionary of Contemporary EnglishKeystone Cops, thethe Keystone CopsˌKeystone ˈCops, the a group of characters in humorous US silent films. They are police officers who are very stupid and are always making silly mistakes. A group of people, especially police officers, are sometimes compared to the Keystone Cops if they fail to do something properly because they have made stupid mistakes.