If something deforms a person's body or something else, it causes it to have an unnatural shape. In technical English, you can also say that the second thing deforms. Bad rheumatoid arthritis deforms limbs the ability of a metal to deform to a new shape without cracking. + deformed de·formed He was born with a deformed right leg. + deformation deformations de·for·ma·tion Changing stresses bring about more cracking and rock deformation. if you deform something, or if it deforms, its usual shape changes so that its usefulness or appearance is spoiled
alter the shape of (something) by stress; "His body was deformed by leprosy" become misshapen; "The sidewalk deformed during the earthquake" make formless; "the heat deformed the plastic sculpture
[ di-'form, dE- ] (verb.) 15th century. Middle English, from Old French or Latin; Old French deformer, from Latin deformare, from de- + formare to form, from forma form.