DuckCorp Dico

Found one definition

1.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                   
   
   
                   
                     
    (ateji (phonetic) reading)  叱 /(en)tʃˈaɪniːz(ja)lˈe̞tə/,  (ateji (phonetic) reading)  𠮟 /lˈe̞tənˈiːɹˈe̞ibˈiːkʲˈɯᵝɯᵝˈe̞f/, しっ /ɕˈiʔ/
   1. (interjection (kandoushi))
            Note: word usually written using kana aloneshh! (used to silence someone), sh!
   2.
            Note: word usually written using kana aloneshoo! (used to drive off an approaching animal, etc.)