Whispering is what you do when you speak so softly that you can barely be heard. Most teachers have a rule that there's no whispering allowed while the class is taking a test.

Whispering involves using your breath, rather than your vocal cords, to speak very quietly. You might hear whispering in the quiet section of the library or during a play or movie — it's used for communicating secrets or simply to avoid bothering other people. The word can also be used as an adjective for sounds that resemble a whisper, like the whispering wind through the trees on a breezy day.

Definitions of whispering

n speaking softly without vibration of the vocal cords

susurration, voicelessness, whisper
stage whisper
a loud whisper that can be overheard; on the stage it is heard by the audience but it supposed to be inaudible to the rest of the cast
Type of:
speaking, speech production
the utterance of intelligible speech

n a light noise, like the noise of silk clothing or leaves blowing in the wind

rustle, rustling, whisper
Type of:
sound of any kind (especially unintelligible or dissonant sound)

adj making a low continuous indistinct sound

murmuring, susurrant
(of sound) relatively low in volume

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