English to English

verb (v)

• pronounce with an initial sibilant(verb.communication)

  source: wordnet30
• utter a sibilant(verb.communication)

  source: wordnet30
• express or utter with a hiss(verb.communication)

  Synonym:
  hiss, siss, sizz
  

  source: wordnet30
• make a sharp hissing sound, as if to show disapproval(verb.communication)

  source: wordnet30
• To pronounce with a hissing sound, like that of the letter s; to mark with a character indicating such pronunciation.(verb)

  source: webster1913