Full of life, fun, and energy — used for a party, a place, a time, or the people in it. If you say "a swinging party", you mean everyone is having a great time: music, dancing, noise, nobody sitting in the corner looking at their phone. If you say "swinging London" or "the swinging sixties", you mean a time when a city felt young and free and exciting.

Full of life, fun, and energy充滿活力、好玩又熱鬧 — used for a party, a place, a time, or the people in it可以形容派對、地方、時代或裡面的人。If you say "a swinging party"如果你說「a swinging party」, you mean everyone is having a great time意思是大家都玩得很開心: music, dancing, noise音樂、跳舞、吵鬧, nobody sitting in the corner looking at their phone沒有人坐在角落滑手機。If you say "swinging London" or "the swinging sixties"如果你說「swinging London」或「the swinging sixties」, you mean a time when a city felt young and free and exciting意思是那個城市曾經感覺很年輕、自由又刺激的一段時光

Here is the honest part. This meaning of the word belongs to the 1960s. It was very popular then, and it has never really stopped sounding like the 1960s. So when people use it today, they are often half-joking, or they are talking about that time on purpose. An older person might say it straight. A younger person saying "what a swinging party" is usually being funny, the way you might use an old song. It is not wrong to say — it just carries a date on it, the way clothes do.

Here is the honest part老實說. This meaning of the word belongs to the 1960s這個意思是屬於一九六〇年代的. It was very popular then那時候非常流行, and it has never really stopped sounding like the 1960s而且到現在聽起來還是很有那個年代的味道。So when people use it today所以現在的人用這個字時, they are often half-joking常常是半開玩笑, or they are talking about that time on purpose或是故意在講那個年代。An older person年紀較大的人 might say it straight可能是認真這樣講。A younger person saying "what a swinging party"年輕人如果說「what a swinging party」 is usually being funny通常是在搞笑, the way you might use an old song就像你會故意唱一首老歌一樣。It is not wrong to say這樣講並沒有錯 — it just carries a date on it只是帶著年代感, the way clothes do就像衣服的款式一樣

You should also know that the same word has a second life. "Swinging" is also the name for married couples swapping partners for sex — that came from swing dancing, where you changed partner after each dance. Because of that, "a swinging couple" means something quite specific, and not "a fun couple".

You should also know你也該知道 that the same word has a second life這個字還有另一層意思。"Swinging"「swinging」 is also the name for married couples swapping partners for sex也指已婚夫妻交換性伴侶 — that came from swing dancing這個用法來自 swing dance（搖擺舞）, where you changed partner after each dance在那種舞裡每跳完一支舞就會換舞伴。Because of that因為這樣, "a swinging couple"「a swinging couple」 means something quite specific意思很明確, and not "a fun couple"而不是「很會玩的一對」

The two meanings almost never get confused in real sentences, because the first one describes places and times (a party, a club, an era) and the second one describes people. But it is worth knowing so that no one surprises you.

The two meanings這兩個意思 almost never get confused in real sentences在實際句子裡幾乎不會搞混, because the first one describes places and times (a party, a club, an era)因為第一個意思是形容地方和時代（派對、俱樂部、年代） and the second one describes people第二個意思是形容人。But it is worth knowing不過知道一下還是好的 so that no one surprises you才不會被嚇到

And of course the plain meaning is always there too: "swinging" is just the -ing form of the verb "swing" — her arms were swinging, the door was swinging open.

And of course當然 the plain meaning is always there too最普通的意思也一直都在: "swinging"「swinging」 is just the -ing form of the verb "swing"就只是動詞 swing 的 -ing 形式 — her arms were swinging比如她的手臂在擺動, the door was swinging open門在搖擺著打開