American English

Definition of jackboot noun from the Oxford Advanced American Dictionary



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  1. 1[countable] a tall boot that reaches up to the knee, worn by soldiers, especially in the past
  2. 2the jackboot [singular] used to refer to cruel military rule to be under the jackboot of a dictatorial regime It was only a matter of time before the heel of the jackboot smashed down.
See the Oxford Advanced Learner's Dictionary entry: jackboot