Source : Webster's Revised Unabridged Dictionary (1913)

Pucker \Puck"er\, v. t. & i. [imp. & p. p. {Puckered}; p. pr. &
   vb. n. {Puckering}.] [From {Poke} a pocket, small bag.]
   To gather into small folds or wrinkles; to contract into
   ridges and furrows; to corrugate; -- often with up; as, to
   pucker up the mouth. ``His skin [was] puckered up in
   wrinkles.'' --Spectator.

Pucker \Puck"er\, n.
   1. A fold; a wrinkle; a collection of folds.

   2. A state of perplexity or anxiety; confusion; bother;
      agitation. [Prov. Eng. & Colloq. U. S.]

Source : WordNet®

pucker
     n : an irregular fold in an otherwise even surface (as in cloth)
         [syn: {ruck}]
     v 1: to gather something into small wrinkles or folds; "She
          puckered her lips" [syn: {rumple}, {cockle}, {crumple},
          {knit}]
     2: draw fabric together and sew it tightly [syn: {gather}, {tuck}]
     3: become wrinkled or drawn together; "her lips puckered" [syn:
         {ruck}, {ruck up}]