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Verb: siss  sis
Usage: US, informal
  1. Express or utter with a hiss
    "She sissed angrily at the interruption";
    - hiss, sizz [US, informal], sibilate
     
  2. Make a sharp hissing sound, as if to show disapproval
    "The crowd sissed when the referee made a bad call";
    - hiss, sizz [US, informal], sibilate

Sounds like: sinking, syncing, synchins, si

Derived forms: sissed, sisses, sissing

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