Italian policeman, 1660s, from Italian, "police officer" (plural sbirri), from Late Latin birrus "red," from Greek pyrros "red," literally "fire-colored," from pyr "fire" (see fire (n.)). With unoriginal prefix (cf. Spanish esbirro). Probably so called from the original color of the uniform.
Examples from the Web for sbirro
But what manner of companion would this sbirro make in times of peace?Love-at-Arms
It is decidedly blood, whispered the sbirro to one of his companions.
Signor Wagner, a wealthy German, was the reply given by a sbirro.
The sbirro at once stepped towards the group, which consisted of two persons.The Pirate City
The sbirro darting forward, pistol in hand, ordered them to stand.