silencer

/ˈsaɪlənsər/
noun
  1. A device attached to a gun that reduces the noise when it is fired.
    • The spy attached a silencer to his pistol before entering the building.
    • The movie's action scene was unrealistic because the silencer made almost no sound.
    • In many countries, owning a gun silencer without a license is illegal.
  2. A person or thing that makes something quiet or stops someone from speaking.
    • The new law acted as a silencer on public protests.
    • Her stern look was enough of a silencer for the noisy children.
    • The librarian was a natural silencer, shushing anyone who spoke too loudly.
Antonyms
What does "silencer" mean? | whatsthatwordmean | whatsthatwordmean