sir
definitions
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noun
a polite form of address for a man, especially one of high rank or in a formal settingfr: monsieur
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noun
a title for a knight or high-ranking officialfr: chevalier
examples
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Sir, may I ask a question?
Monsieur, puis-je poser une question?
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Sir Arthur was a brave knight.
Sir Arthur était un chevalier courageux.