Sir is a formal honorific address in English for men, derived from Sire in the High Middle Ages. Both are derived from the old French " Sieur " (Lord), brought to England by the French-speaking Normans, and which now exists in French only as part of "Monsieur" lit. 'my lord'.

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SIR definition: 1. used as a formal and polite way of speaking to a man, especially one who you are providing a…. Learn more.

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sir (third-person singular simple present sirs, present participle sirring, simple past and past participle sirred) (transitive, informal) To address another individual using "sir". coordinate terms quotations Coordinate terms: ma'am, mam Sir, yes, sir! —Don't you sir me, private! I work for a living!

SIR definition: a respectful or formal term of address used to a man. See examples of sir used in a sentence.