DuckCorp Dico

Found one definition

1.                 From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   swing-wing /swˈɪŋ wˈɪŋ/
   Schwenkflügel <masc>, Verstellflügel <masc> [aviat.]
         "swing-wings"  - Schwenkflügel, Verstellflügel
      Synonym: variable-geometry wing