DuckCorp Dico

Found one definition

1.                 From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   stiffing /stˈɪfɪŋ/
   Verstrebung <fem>, Versteifung <fem>, Aussteifung <fem>, Absteifung <fem> [constr.]
      Synonyms: bracing, strutting, stiffening
    see: bracings, struttings, stiffings, stiffenings, trench bracing