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incest between [relatives]
incest 通常为不可数名词，不加冠词；涉及双方时用 between 引出。
Incest between close relatives is forbidden in almost every society.
近亲之间的乱伦在几乎所有社会中都被禁止。
乱伦；近亲相奸
incests — plural of incest
先理解核心含义，再看它在真实句子里的用法。
乱伦；近亲相奸
sexual intercourse between relatives too closely related to marry, such as a parent and child
Incest between close relatives is forbidden in almost every society.
近亲之间的乱伦在几乎所有社会中都被禁止。
Sexual relations between close relatives, especially immediate family members and sometimes first cousins, usually considered taboo.
Romantic relationships between close relatives, also widely taboo.
The novel explores how incest destroys the bonds within a family.
这部小说探讨了乱伦如何破坏家庭内部的纽带。
In many cultures, incest is considered a serious crime and a taboo.
在许多文化中，乱伦被视为严重的罪行和禁忌。
The documentary interviewed survivors of incest to raise public awareness.
这部纪录片采访了乱伦的幸存者，以提高公众意识。
incest 通常为不可数名词，不加冠词；涉及双方时用 between 引出。
Incest between close relatives is forbidden in almost every society.
近亲之间的乱伦在几乎所有社会中都被禁止。
表达“犯乱伦罪”常用动词 commit，也可用 have 或 perform，但不如 commit 正式。
He was convicted of committing incest with his daughter.
他因与女儿乱伦而被定罪。
表示“乱伦的受害者/幸存者”时，可用 victim/survivor of incest 或复合词 incest victim/survivor。
The organization supports adult survivors of incest.
该组织为成年乱伦幸存者提供支持。
an act of incest 为可数短语，指具体的乱伦行为；泛指现象时仍用不可数的 incest。
The film deals with an act of incest and its consequences.
这部电影讲述了一起乱伦行为及其后果。
Not this
They have an incest relationship.
Use this
They have an incestuous relationship.
incest 是名词，不能直接修饰 relationship；应改用形容词 incestuous（乱伦的）。
Not this
He did incest with his sister.
Use this
He committed incest with his sister.
表示“乱伦/犯乱伦罪”时，incest 应搭配动词 commit，构成固定动宾搭配；do 没有这种用法。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
犯乱伦罪
He was convicted of committing incest with his daughter.
他因与女儿乱伦被判有罪。
乱伦禁忌
The incest taboo exists in almost every culture.
乱伦禁忌几乎存在于每一种文化中。
乱伦幸存者
The organization provides support for incest survivors.
该组织为乱伦幸存者提供支持。
兄弟姐妹间的乱伦
Incest between siblings is illegal in most countries.
兄弟姐妹间的乱伦在大多数国家都是非法的。
乱伦指控
The allegations of incest were never proven in court.
这些乱伦指控从未在法庭上得到证实。
企业裙带关系
The regulator accused the company of corporate incest for awarding contracts to firms owned by its own executives.
监管机构指责该公司存在企业裙带关系，因为其将合同授予了由本公司高管所有的企业。
学术近亲繁殖
To bring in fresh perspectives, the university now limits academic incest in its faculty hiring.
为了引进新的观点，该大学现在在教师招聘中限制学术近亲繁殖。
Use incests naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 -cest 联想成 nest（巢）：同一巢中的近亲发生关系，就是乱伦。
语域：neutral 常见场景：法律/罪案报道、心理学/临床讨论、正式新闻讨论 ‘incest’ 是中性、标准的用词，不属于俚语；但因话题敏感，多用于法律、心理学或罪案报道等严肃或正式语境，在日常口语中比较少见。
本词尾部的 -est 发音为 /ɛst/，与 best、chest、guest、rest、test 的结尾相同；但 incest 的重音在第一音节（IN-sest），所以这些单音节词并非完全押韵。另外，insect 拼写很像 incest，但它结尾是 /ɛkt/，不是 /ɛst/。
Dictionary facts from ECDICT, WIKTIONARY.