DuckCorp Dico

Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   
   ** English
   
   *** Noun
   [s]
   
    1. An instrument , with a vibrating tongue fixed in a frame, which slips over the teeth of a ratchet  wheel and produces a loud raucous  sound when whirled around, once used by watchmen  to warn of danger
   **** Synonyms
   
    - [en]  [obsolete slang]