I. ˈ ̷ ̷ˌ ̷ ̷ noun
1. : a heavy military boot especially of glossy black leather extending well above the knee and having a wide flaring top and worn especially during the 17th and 18th centuries
2. : a military boot without laces that reaches to the calf
3. : a boot similar in shape to the older military jackboot and worn especially by fishermen
II. noun
: the spirit or policy of militarism or totalitarianism
hurried to completion under threat of Hitler's jackboot — Commonweal