Synonyms for Let voice be heard:

• v.

  •speak out/speak up (verb)
  • come out with,
  • assert,
  • insist,
  • declare.

• Other synonyms:

  •Other relevant words:
  • sound off,
  • stand up for,
  • make plain,
  • make oneself heard,
  • have one's say,
  • say loud and clear,
  • speak loudly,
  • speak one's mind,
  • stood up for.

Antonyms for Let voice be heard:

• v.

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