• n. 先生；（用于姓名前）爵士；阁下；（中小学生对男教师的称呼）先生；老师
• n. （苏丹、德）西尔（人名）

来自古法语 sire,阁下，主，缩写自拉丁语 senior,长者，老者，即 senior.后作为对男士的尊称。

sir

sir: [13] In common with many other European terms of address for men (such as monsieur and se?or), sir goes back ultimately to Latin senior ‘older’ (source also of English senior). This was reduced in Vulgar Latin to *seior, which found its way into Old French as *sieire, later sire. English borrowed this as sire [13], which in weakly-stressed positions (prefixed to names, for instance) became sir.

Other titles based on senior that have found their way into English include French monsieur [15] (literally ‘my sire’), together with its plural messieurs [17], abbreviated to messrs [18]; French seigneur [16]; Spanish se?or [17]; and Italian signor [16]. Surly [16] is an alteration of an earlier sirly ‘lordly’, a derivative of sir.

The meaning ‘grumpy’ evolved via an intermediate ‘haughty’.
=> senator, senior, sire, surly

sir

c. 1300, title of honor of a knight or baronet (until 17c. also a title of priests), variant of sire, originally used only in unstressed position. Generalized as a respectful form of address by mid-14c.; used as a salutation at the beginning of letters from early 15c.

1. Sir Robert made his announcement after talks with the President.

在与总统会谈之后，罗伯特爵士发表了声明。

来自柯林斯例句

2. Sir Denis took one look and sent it back.

丹尼斯爵士看了一眼就把它送了回去。

来自柯林斯例句

3. Sir Geoffrey had no personal animosity towards the Prime Minister.

杰弗里爵士对首相并无私人恩怨。

来自柯林斯例句

4. "We need proof, sir." Another pause. Then, "Very well."

“我们需要证据，先生。”又是一个短暂停顿。然后，“那好吧。”

来自柯林斯例句

5. Ben Brantley's article on Sir Ian McKellen rekindled many memories.

本·布兰特利的那篇关于伊恩·麦凯伦爵士的文章唤起了许多记忆。

来自柯林斯例句