a taboo subject, word, activity etc is one that people avoid because it is extremely offensive or embarrassing
〔因会冒犯人或引起尴尬而〕禁忌的，忌讳的:
【例句】
Rape is a taboo subject .
强奸是忌讳的话题。
2.
【释义】
not accepted as socially correct
忌讳的，为社会习俗所不容的:
【例句】
It's taboo to date a man a lot younger than you.
和一个年龄比你小很多的男人约会是犯忌讳的。
3.
【释义】
too holy or evil to be touched or used
〔因太神圣或太邪恶而〕禁止接触的，禁止使用的
noun
1.
【释义】
a custom that says you must avoid a particular activity or subject, either because it is considered offensive or because your religion does not allow it
禁忌，忌讳:
【例句】
There are taboos against appearing naked in public places.
