A glossy leather calf-covering military boot, commonly associated with German soldiers of the WWII era.

(transitive) To stamp on with a jackboot. / (intransitive) To march in jackboots.

plural of jackboot

Wearing jackboots. / (figuratively) Authoritarian or oppressive, especially in a cruel or violent manner.

simple past tense and past participle of jackboot

present participle of jackboot