megaphones

/M EH1 G AH0 F OW0 N Z/
noun
  1. 1

    A portable, usually hand-held, funnel-shaped device that is used to amplify a person’s natural voice toward a targeted direction.

  2. 2

    Mouthpiece or promoter; one who speaks for or publicizes on behalf of another.

verb
  1. 1

    To use a megaphone; to speak through a megaphone.

Source: https://en.wiktionary.org/wiki/megaphone, https://en.wiktionary.org/wiki/megaphones