Definition of perfect crime in English:
A crime so ingeniously contrived and carefully executed that it cannot be detected or solved.
- It was the perfect crime, but a crime nonetheless.
- Her action has led to the arrest of the partner and her son, who believed they had executed a perfect crime.
- A gang of misfits are rounded up to commit the perfect crime, but the bungling burglars bite off more than they can chew in this screwball comedy.