Source : Webster's Revised Unabridged Dictionary (1913)

Hotspur \Hot"spur`\, n. [Hot + spur.]
   A rash, hot-headed man. --Holinshed.

Hotspur \Hot"spur`\, Hotspurred \Hot"spurred`\, a.
   Violent; impetuous; headstrong. --Spenser. Peacham.

Source : WordNet®

Hotspur
     n 1: English soldier killed in a rebellion against Henry IV
          (1364-1403) [syn: {Percy}, {Sir Henry Percy}, {Harry
          Hotspur}]
     2: a rash or impetuous person