Question

What is mean by SIR ? I want urgently. ​

Answer 1

Answer:

Sir is a formal English honorific address for men, derived from Sire in the High Middle Ages. Traditionally, as governed by law and custom, "Sir" is used for men titled as knights, i.e., of orders of chivalry, and later also applied to baronets and other offices.

Answer 2

used as a polite way of speaking to a man whose name you do not know, for example in a shop or restaurant, or to show respect