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

Derived forms: sizzed, sizzes, sizzing

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