Meaning

verb make formless

verb twist and press out of shape

verb cause (a plastic object) to assume a crooked or angular form

originFrom Middle English deformen (“to disfigure, distort, or mar; (figuratively) to disfigure morally; to defame; to dishonour”) [and other forms], equivalent to de- + form, from Old French deformer [and other forms] (modern French déformer (“to contort, distort, twist out of shape; (figuratively) to pervert”)), or directly from its etymon Latin dēfōrmāre (whence Medieval Latin difformāre), the…

Etymology from Wiktionary, CC BY-SA 3.0