Definitions of deform:

• verb:   alter the shape of (something) by stress

  Example: "His body was deformed by leprosy"

• verb:   become misshapen

  Example: "The sidewalk deformed during the earthquake"

• verb:   make formless

  Example: "The heat deformed the plastic sculpture"

• verb:   twist and press out of shape
• verb:   cause (a plastic object) to assume a crooked or angular form
• verb:   assume a different shape or form