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Jyutping si1
Pinyin

Definitions (CC-CEDICT)
  1. (onom.) to hiss
  2. to whistle
  3. to whiz
  4. to fizz
Definitions (CC-CANTO)
  1. (onom.) to hiss/to whistle/to whiz/to fizz/a call to come
Definitions (Wiktionary)
  1. character, onomatopoeic
    to hiss; to whistle; to fizz
Definitions (Unihan)
  1. hiss
  2. a call to come
  3. Cangjie Input - Simplified
    RVVM
  4. Cangjie Input - Traditional
    RVFF