低てい声せい

noun

low voice; whisper

Refers to speaking in a quiet, subdued voice, often to avoid being overheard or to show discretion.

• 彼かれは低てい声せいで秘ひ密みつを教おしえてくれた。

  He told me the secret in a low voice.

• 図と書しょ館かんでは低てい声せいで話はなしてください。

  Please speak in a low voice in the library.