Clean one's clock American informal verb phrase
To decisively beat someone up
Shut your mouth up or I'll clean your clock .
James' opponent was so strong that he cleaned James' clock.
The verb "clean" should be conjugated according to its tense.
The phrase dates from the mid-1900s. This term originated in the military. The use of "clock" is unclear but possibly alludes to hitting someone in the face (for “clockface”).
A legal matter that is very easy to solve
The house owners didn't lock the doors before going out, and that's why they got broken in. This is an open and shut case.