deform [dɪˈfɔ:m]

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vt.损坏…的形状；使变形，使变丑；vi.变形

to spoil the usual and true shape of something

Shoes that are too tight deform the feet. (穿)太紧的鞋子会使脚变形。
Ice crystals begin to deform measurably. 冰晶就产生某种程度的变形了。