DuckCorp Dico

Found one definition

1.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                   
   
   
                   
                     
   脱 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, だつ /dˈätsɯᵝ/
   (prefix)
   de- (indicating reversal, removal, etc.)