Definitions from Wiktionary (deform)

▸ adjective:  (obsolete except poetic) Having an unusual and unattractive shape; deformed, misshapen; hence, hideous, ugly.
▸ verb:  (transitive)
▸ verb:  To change the form of (something), usually thus making it disordered or irregular; to give (something) an abnormal or unusual shape.
▸ verb:  (engineering, physics) To alter the shape of (something) by applying a force or stress.
▸ verb:  (also figuratively) To change the look of (something), usually thus making it imperfect or unattractive; to give (something) an abnormal or unusual appearance.
▸ verb:  To mar the character or quality of (something).
▸ verb:  (intransitive) To become changed in shape or misshapen.

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