Definition of "hissing" []

• Present participle of hiss. (verb)
• The sound of a hiss (noun)

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• "I read the first 50 pages of each one hoping to drown out the hissing from the O² machine."
• "Besides, if folks want to have at him, they shouldn't have to enter his squalid den and endure the inevitable spitting and hissing from the corners."
• ""He represents a party which has been nothing but obstructionist," sputtered Valeriani, amid much booing and hissing from the audience."