D defs.my
Entry 1 sense Webster, 1913

Warpath

/wôr'-păthˌ/ · War·path · IPA /wˈɔrpˌæθ/
01 n. The route taken by a party of Indians going on a warlike expedition.
  1. 1.
    The route taken by a party of Indians going on a warlike expedition.
Phrases & compounds
On the warpath — on a hostile expedition; hence, colloquially, about to attack a person or measure.