(v. i.) To make with the mouth a prolonged sound like that of the letter s, by driving the breath between the tongue and the teeth; to make with the mouth a sound like that made by a goose or a snake when angered; esp., to make such a sound as an expression of hatred, passion, or disapproval.
HISS
Meaning of HISS in English
Webster's English dictionary. Английский словарь Webster. 2012