Synonyms for Letting voice be heard:

• v.

  •speak out/speak up (verb)
  • stand up for,
  • speak loudly,
  • let voice be heard,
  • come out with,
  • say loud and clear,
  • insist,
  • sound off,
  • make oneself heard,
  • speak one's mind,
  • assert,
  • make plain,
  • have one's say,
  • declare.

Antonyms for Letting voice be heard:

• v.

  • speak out/speak up
    shut up, be quiet.