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

Sounds like: sinking, syncing, synchins, si

Derived forms: sissing, sisses, sissed

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