Sprack \Sprack\ (spr[a^]k), a. [Cf. Icel. spraekr sprightly, dial. Sw. spr[aum]k, spr[aum]g, spirited, mettlesome; or Gael. spraic vigor.] Quick; lively; alert. [Prov. Eng. & Scot.] [1913 Webster]