Definition of "sir"
noun:
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A man of a higher rank or position.
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An address to a military superior of either sex.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
An address to any male, especially if his name or proper address is unknown.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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verb:
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To address somebody using sir.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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