Source : Webster's Revised Unabridged Dictionary (1913)

Brisk \Brisk\, a. [Cf. W. brysg, fr. brys haste, Gael. briosg
   quick, lively, Ir. broisg a start, leap, jerk.]
   1. Full of liveliness and activity; characterized by
      quickness of motion or action; lively; spirited; quick.

            Cheerily, boys; be brick awhile.      --Shak.

            Brick toil alternating with ready ease. --Wordworth.

   2. Full of spirit of life; effervesc?ng, as liquors;
      sparkling; as, brick cider.

   Syn: Active; lively; agile; alert; nimble; quick; sprightly;
        vivacious; gay; spirited; animated.

Brisk \Brisk\, v. t. & i. [imp. & p. p. {Bricked}; p. pr. & vb.
   n. {Bricking}.]
   To make or become lively; to enliven; to animate; to take, or
   cause to take, an erect or bold attitude; -- usually with up.

Source : WordNet®

brisk
     adj 1: quick and energetic; "a brisk walk in the park"; "a lively
            gait"; "a merry chase"; "traveling at a rattling
            rate"; "a snappy pace"; "a spanking breeze" [syn: {lively},
             {merry}, {rattling}, {snappy}, {spanking}, {zippy}]
     2: imparting vitality and energy; "the bracing mountain air"
        [syn: {bracing}, {energizing}, {energising}, {fresh}, {refreshing},
         {refreshful}, {tonic}]
     3: very active; "doing a brisk business"

brisk
     v : become brisk; "business brisked up" [syn: {brisk up}, {brisken}]