has been puckering

• present perfect progressive

  present perfect progressive

  Used to describe an action that began in the past, has continued continuously, and is still in progress.

  of pucker (3rd person singular).
  pucker

  verb (used with or without object)

  to draw or gather into wrinkles or irregular folds, as material or a part of the face; constrict.

Related Words

• crinkle