jack‧boot /ˈdʒækbuːt/
noun [countable][
Date: 1600-1700;
Origin: Perhaps from jack 'soldier's coat' (14-19 centuries) (from French jaque; ⇒ jacket) + boot]
a boot worn by soldiers that covers their leg up to the knee
—jackbooted adjective [TahlilGaran] Dictionary of Contemporary English ▲