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Verb: siss
  1. Express or utter with a hiss
    - hiss, sizz, sibilate
     
  2. Make a sharp hissing sound, as if to show disapproval
    - hiss, sizz, sibilate

Derived forms: sissed, sisses, sissing

Type of: emit, let loose, let out, mouth, speak, talk, utter, verbalise [Brit], verbalize