sirKK [ˋsɝ] /ˈsɝ/名詞1先生對男性的敬稱Excuse me, sir, I think you dropped your wallet.先生,不好意思,我想您的錢包掉了。2長官軍警或上司Yes, sir, the report will be on your desk by noon.是的,長官,報告中午前會放到您桌上。3爵士英式,用於姓名前After the ceremony he was formally addressed as Sir Thomas.儀式過後,他正式被稱為湯瑪斯爵士。4老師英式,稱男老師Sir, may I hand in my essay tomorrow morning?老師,我可以明天早上再交報告嗎?5先生、敬啟者正式書信The complaint letter opened with a stiff "Dear Sir."那封投訴信以生硬的「敬啟者」開頭。