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1. A thick military boot.
2. A common epithet, used to conflate someone with Nazism.
"I am still without any clear information as to what a jackboot is. It is a kind of boot that you put on when you want to behave tyrannically: that is as much as anyone seems to know."

-George Orwell
by nedlum February 13, 2006
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1. Thick leather boots that go to the knee, used my military forces in the 17th, 18th, and 19th centuries.

2. Someone (usually a leader of military or police forces) that will do whatever it takes to accomplish their goals, the walking embodiment of "the ends justify the means".
1. The captain wore a pair of Jackboots with spurs to make his horse run faster.

2. The general sure is a jackboot, I hear he had 2 men whipped for leaving their post 2 minuets early
by Aries13XIII June 18, 2018
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Thoes cool boots the Nazi's use to goose step with
Jackboots are used for heiling and marching
by The Col. November 27, 2004
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