To hum or buzz.
To make a hissing sound.
To call someone by hissing.
To condemn or express contempt (for someone or something) by hissing.
To utter (something) with a hissing sound.
To whisper, especially angrily or urgently.
To emit or eject (something) with a hissing sound.
To move with a hissing sound.
A sibilant sound, such as that made by a snake or escaping steam; an unvoiced fricative.
An expression of disapproval made using such a sound.