cheerleader

noun
  1. 1

    A person, usually a young, attractive female, who encourages applause and cheers at a sports event, and wearing a specially-designed uniform in the official colors of the team he/she cheers for.

  2. 2

    A person who rallies support for any cause.

Antonyms

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Source: https://en.wiktionary.org/wiki/cheerleader