1
a foursome of + [plural noun]
foursome 是可数名词，指被看作一个整体的四个人。
A foursome of friends went hiking together.
四个朋友一起去徒步旅行了。
四人组；四人对抗赛
foursomes — plural of foursome
先理解核心含义，再看它在真实句子里的用法。
四人组；四人对抗赛
four people considered as a unit
A foursome of friends went hiking together.
四个朋友一起去徒步旅行了。
四人一组,四重奏或由四人(尤指两队两人)进行的比赛(如高尔夫球)
A group of four, a quartet or a game (such as golf) played by four players, especially by two teams of two.
四人之间的性行为
A sex act between four people.
The foursome sat down at the table by the window and ordered coffee.
这四个人的小组在窗边的桌子旁坐下，点了咖啡。
We formed a foursome for the bridge tournament last weekend.
上周末我们组成了四人组参加桥牌锦标赛。
The teacher divided the class into foursomes for the group project.
老师把全班分成四人小组来做小组项目。
foursome 是可数名词，指被看作一个整体的四个人。
A foursome of friends went hiking together.
四个朋友一起去徒步旅行了。
在体育（尤其是高尔夫）语境中，a foursome 可指四人一组或两两对抗的比赛。
They played a foursome against the neighboring club.
他们和邻近的俱乐部进行了一场四人对抗赛。
as a foursome 作状语，表示“以四人一组的方式”。
The band performed as a foursome for the first time.
这支乐队第一次以四人组的形式演出。
Not this
We are foursome.
Use this
We are a foursome.
foursome 为可数名词，作“一个四人组”讲时单数前须加不定冠词 a；汉语名词前没有冠词系统，所以学习者容易漏掉。加上 a 后语法正确。
Not this
They are a group of foursome.
Use this
They are a foursome.
foursome 本身即表示“四人组成的一组”，后面作表语时直接用 a foursome 即可；在 a group of 后接 foursome 会语义重复，也不符合英语中 group of 后接成员或类别名词的搭配。改成 a foursome 后既简洁又准确。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
四个朋友的一伙人
A foursome of friends shared a taxi to the airport.
四个朋友合乘一辆出租车去机场。
进行四人对抗赛
We played a foursome at the golf course yesterday.
我们昨天在高尔夫球场打了一场四人对抗赛。
高尔夫四人对抗赛
The club organizes a golf foursome every Sunday morning.
俱乐部每周日上午组织一场高尔夫四人对抗赛。
加入四人组
Do you mind if I join your foursome?
你介意我加入你们这组四人吗？
凑成四人一组
We need one more player to make up a foursome.
我们还需要一名选手才能凑成四人一组。
混合四人赛
The tournament ends with a mixed foursome on Friday.
锦标赛周五以一场混合四人赛收尾。
Use foursomes naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 four（四）+ some（某些人）：一伙正好四人，高尔夫四人赛也用它记。
语域：neutral 常见场景：高尔夫比赛、朋友结伴出行、集体活动 名词foursome通常指四人一组或四人对抗赛，多用于提及人数分组的场合，比较常见于高尔夫等比赛或朋友结伴外出。语气中性，不算正式用语或俚语。
发音说明：这些词都以 -some 结尾，读 /səm/，但重读元音各不相同。在给出的音标中，没有词与 foursome /ˈfɒːsəm/ 完全押韵。Awesome /ˈɔːsəm/ 最为接近，但元音仍有区别；handsome /ˈhænsəm/、lonesome /ˈləʊnsəm/ 等是常见的拼写相似词，读音差异明显，需注意。
Dictionary facts from ECDICT, WIKTIONARY.