Webster's English Dictionary

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hiss

hiss \'his\ vb [ME hissen, of imit. origin] : to make a sharp sibilant 
   sound like that of the speech sound /s / or that emitted by an alarmed 
   goose or snake often as an expression of disapproval 1: to condemn by 
   hissing  2: to utter with a hiss  - hiss n