Definitions of pucker:

• noun:   an irregular fold in an otherwise even surface (as in cloth)
• verb:   to gather something into small wrinkles or folds

  Example: "She puckered her lips"

• verb:   become wrinkled or drawn together

  Example: "Her lips puckered"

• verb:   draw fabric together and sew it tightly
• name:  A surname (very rare: popularity rank in the U.S.: #79533)