Etymology
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jackboot (n.)

also jack-boot, 1680s, type of large, strong over-the-knee cavalry boot of 17c.-18c., later a type worn by German military and para-military units in the Nazi period. From jack (n.), though the exact sense here is unclear + boot (n.1). Figurative of military oppression since 1768. Related: Jackbooted.

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Definitions of jackboot

jackboot (n.)
(19th century) a man's high tasseled boot;
Synonyms: Hessian boot / hessian / Wellington / Wellington boot
From wordnet.princeton.edu