它强调“有礼仪地结束在场状态”，比普通的“leave”或“say goodbye”更正式，常用于书面语、正式场合（如商务会面、宴会、拜访等）。
1、 基本结构：take one's leave（one's 随主语变化，如 my/your/his/her/their）
例：I think it's time I took my leave—it's getting late.（我想我该告辞了——时间不早了。）
例：She took her leave quietly without disturbing anyone.（她悄悄离开，没打扰任何人。）
2、 接介词 of，表示“向…告辞”：take one's leave of sb.
例：He took his leave of the guests and went to answer the phone.（他向客人告辞，去接电话了。）
例：Before leaving, please take your leave of the host.（离开前，请向主人道别。）
3、 修饰词搭配：常与副词（如 politely/graciously 等）连用，强调“礼貌地告辞”
例：The diplomat politely took his leave after the meeting.（外交官会后礼貌地告辞。）
例：She graciously took her leave when the conversation turned awkward.（话题变得尴尬时，她得体地告辞了。）
这个短语还有一个常用的引申义：失去理智；发疯（to behave in a crazy or irrational way）。
例：Are you taking leave of your senses? You can't quit your job without another offer!（你疯了吗？没找到下家就辞职？）
注：这个引申义是固定搭配，不要与“告辞”的原意混淆。
正式场合：商务会议、晚宴、拜访长辈/上级时，用“take one's leave”更符合礼仪；
书面语：小说、散文、正式信件中，替代“leave”以增强文雅感；
日常对话：较少使用（日常更常用“leave”“say goodbye”“head out”等），但在需要“正式感”的对话中可以用。
例句 recap：1、 As the party ended, most guests took their leave one by one.（派对结束时，大多数客人陆续告辞。）
2、 May I take my leave now? I have a train to catch.（我现在可以告辞吗？我要赶火车。）
3、 He took his leave of the king and returned to his country.（他向国王道别，返回了自己的国家。）
简言之，take one's leave 是“告辞”的正式说法，核心是“礼貌、有仪式感地离开”，记住它的结构和引申义，就能准确使用啦！