sir
sir synonyms
sir definitions
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To address (someone) using "sir".
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A man of a higher rank or position.
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to a teacher.
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to a knight or other low member of the peerage.
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to a superior military officer.
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A respectful term of address to a man of higher rank or position
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A respectful term of address to an adult male (often older), especially if his name or proper title is unknown.