sacrilege

If you show up to an animal rights rally with a bucket full of fried chicken for lunch, you may be accused of committing sacrilege. You are violating a belief held sacred, at least by some individuals.

Sacrilege has its roots in the Latin sacr-, meaning "holy." Sacrilege was originally reserved for talking about blasphemous acts that disrespect, violate, or misuse holy traditions or objects. However, today the term sacrilege carries a broader, and lighter, meaning than its origins suggest. For example, it's usually considered sacrilege to root for the out-of-town team that's playing against your home team. Ancient users of this word might think our looser definition is sacrilege.

Definitions of sacrilege
  1. noun
    blasphemous behavior; the act of depriving something of its sacred character
    synonyms: blasphemy, desecration, profanation
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    type of:
    irreverence, violation
    a disrespectful act
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