In lunfardo is a police or military authority, by methonymy with the uniform cap. By extension it is anyone who has or is created with authority over others. See also hold cap, be on the cap.
In Colombia it is synonymous with beret or cachucha. It is a garment that is used on the head and that has a visor. "Cap" means free, unpaid.
Colloquial term for police in Argentina.
Criminal slang word " Cap " means: police, e.g.:-comes the CAP! or - sos Cap vos? 40, 41, argentina;