しーっ

しーっ, シーッ, しー, シーshii

interjection

  1. shh!
  2. shush!
  3. hush!
  4. shoo!
  5. scram!

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences