has been crumpling

• 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 crumple (3rd person singular).
  crumple

  verb (used with object)

  to press or crush into irregular folds or into a compact mass; bend out of shape; rumple; wrinkle.

Related Words

• break down
• buckle
• crush
• scrunch