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sir

SaySUR/sɝ/UK/sɜː(ɹ)/

Pluralsirs

Verbsirs, sirring, sirred

4 meanings of sir

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  1. 1
    polite addressnoun
    A polite word used when speaking to a man, especially a stranger, boss, teacher, or officer.

    Like saying 'mister' to a stranger so you sound polite.

    Excuse me, sir, you dropped your wallet near the door.

    The clerk nodded and said, 'Right this way, sir.'

    UsageUse it alone: Yes, sir. With a family name, say Mr: Mr Brown.

    Note
  2. 2
    knight's titlenoun
    A title used before the first name of a knight or baronet.

    We were introduced to Sir Walter at the garden party.

    She curtsied and greeted Sir Edmund warmly.

    UsagePut it before the first name: Sir Walter, not before the family name alone.

    Oppositedame

  3. 3
    call by titleverbcolloquialtransitive
    To call someone 'sir' when you speak to them.

    Don't sir me. I'm just a coworker, not your boss.

    Please don't sir me. I'm only a few years older than you.

    UsagePeople mostly say Don't sir me. Write sirred and sirring with two r's.

    Note

Less common meaning

  1. 4
    nounarchaiccountable
    A man who has a higher rank or position than others.

    Similarmaster, lord

    Note

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Origin

It comes from a Middle English word 'sir', a short form of 'sire', which came from Old French 'sire' meaning 'master' or 'lord'. That went back to Latin 'senior', meaning 'older'.

Checked 1 Nov 2026 · 3 facts

  • English sir comes from Middle English sir, a reduced form of sire. en.wiktionary.org
  • Middle English sire came from Old French sire, meaning master or lord. en.wiktionary.org
  • Old French sire ultimately derives from Latin senior, meaning older. en.wiktionary.org