tabu

/T AA0 B UW1/
noun
  1. 1

    An inhibition or ban that results from social custom or emotional aversion.

  2. 2

    (in Polynesia) Something which may not be used, approached or mentioned because it is sacred.

verb
  1. 1

    To mark as taboo.

  2. 2

    To ban.

  3. 3

    To avoid.

Source: https://en.wiktionary.org/wiki/taboo, https://en.wiktionary.org/wiki/tabu