English Reference
noun · adjective · verb

taboo

n. · adj. · v.
US /tæˈbu/ UK /tæbˈuː/ taboo UK spelling taboo's, taboo's

  1. 01 B2 Upper Intermediate

    n.a rule or custom that stops people from doing or talking about something because it is seen as wrong or embarrassing.

    n.a social or cultural prohibition resulting from custom or emotional aversion, often governing behaviour or speech deemed offensive.

    Simple

    In many cultures, asking someone about their salary is a social taboo.

    In context

    The documentary explores how various social taboos regarding mental health have shifted significantly over the last few decades.

    Usage

    Often used with the verb 'break' or 'violate'.

  2. 02 C1 Advanced Formal Religion

    n.something that is forbidden because it is considered very holy or sacred.

    n.a prohibition based on the sacred or consecrated status of an object, person, or place, rendering it untouchable or unmentionable.

    Simple

    The tribe has a strict taboo against entering the ancient forest.

    In context

    Anthropologists studied the complex religious taboos that governed who could handle the ceremonial relics during the festival.

    Teacher's tip

    This sense is more technical and academic; in everyday English, 'taboo' usually refers to social awkwardness rather than religious law.

    sanctityinterdiction
  3. 03 B2 Upper Intermediate

    adj.describes something that you must not do or talk about because of social rules.

    adj.proscribed by society as improper or unacceptable; forbidden from use, approach, or mention.

    Simple

    Politics and religion were once considered taboo subjects at the dinner table.

    In context

    The author gained fame by writing about taboo topics that most mainstream publishers were too afraid to touch at the time.

  4. 04 C2 Proficiency FormalTechnical

    v.to officially forbid something or mark it as something that people should avoid.

    v.to place under a taboo; to prohibit or forbid by social or religious authority.

    Simple

    The council decided to taboo any further discussion of the controversial project.

    In context

    Certain traditional societies taboo the naming of the deceased for a specific period following the funeral rites.

    Usage

    This verb is transitive and requires a direct object.

He touches on some questions that feel taboo within this community, such as why middle-class black Britons tend to date white people.

The Guardian· 9 Aug 2026

Borrowed from Tongan tapu (“prohibited, sacred”), from Proto-Polynesian tapu, from Proto-Oceanic tabu, from Proto-Eastern Malayo-Polynesian *tambu. Doublet of kapu. First attested in c. 1777. The p in the Tongan source was misheard as b.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin pqe-pro *tambu
Level B2 · Upper Intermediate
Frequency Frequent
Updated