D defs.my
Entry 2 senses Webster, 1913

jackboot

· IPA /ˈd͡ʒækbuːt/
01 n. a man's high tasseled boot.
  1. 1.
    a man's high tasseled boot.[19th century]
  2. 2.
    A strong leather boot reaching up to or over the knee; it is worn mostly by soldiers.