verb-intransitive. To speak softly, or under the breath, so as to be heard only by one near at hand; to utter words without sonant breath; to talk without that vibration in the larynx which gives sonorous, or vocal, sound. See Whisper, n.verb-intransitive. To make a low, sibilant sound or noise.verb-intransitive. To speak with suspicion, or timorous caution; to converse in whispers, as in secret plotting.v. To utter in a low and nonvocal tone; to say under the breath; hence, to mention privately and confidentially, or in a whisper.v. To address in a whisper, or low voice.v. To prompt secretly or cautiously; to inform privately.n. A low, soft, sibilant voice or utterance, which can be heard only by those near at hand; voice or utterance that employs only breath sound without tone, friction against the edges of the vocal cords and arytenoid cartilages taking the place of the vibration of the cords that produces tone; sometimes, in a limited sense, the sound produced by such friction as distinguished from breath sound made by friction against parts of the mouth. See Voice, n., 2, and Guide to Pronunciation, §§ 5, 153, 154.n. A cautious or timorous speech.n. Something communicated in secret or by whispering; a suggestion or insinuation.n. A low, sibilant sound.