Sir ( form used by Indians addressing Europeans ).

An Arabic word meaning, literally, "friend" or "companion", used in Indian languages as a title or form of address like "Mr." or "Sir". Used as a postfix for someone held in esteem.

sir. Sometimes used to refer to an employer, the word carries a lot of class/racial baggage. It is commonly used to stroke bureaucratic egos.

(h) sir, master

Sahib (the female form is sahiba), from Arabic صاحب, originally "friend, companion," from sahiba صحب "he accompanied", but later used for "Lord", is a Hindi and Bengali word meaning sir, master or, primarily, lord.