Jackbooted points to a tall, stiff soldier’s boot — a jackboot — that does not stop at the ankle. It covers the lower leg right up to the knee. Armies and riders wore that kind of boot so the leg stayed protected. Jackbooted, with the -ed, means “wearing those boots,” or done in that heavy military style. Though actually, in the English you will read most, the word is often stretched: writers say jackbooted police or jackbooted thugs when they want to paint a group as using force like an army, with little kindness. That use is angry and political; it is not a compliment, and it is not really about shopping for shoes. In ordinary talk about footwear people usually just say army boots or tall boots. You will meet jackbooted more in news and arguments than in a shoe shop.

穿長筒軍靴的；長筒軍靴（常帶「高壓、動武」的味道）