Definition of the Keystone Kops from the Oxford Advanced Learner's Dictionary

 

the Keystone Kops

 
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a team of actors who appeared as a group of comic police officers in a series of US silent films (1912-20) produced by Mack Sennett and his Keystone Comedy Company. The leader was played by Ford Sterling, and one of the other Kops was Fatty Arbuckle. They had long and funny scenes in which they chased criminals or wrongly chased innocent citizens, often in cars.