soften [ˈsɒfn]

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vt.(使)变柔软；(使)变柔和；vi.减轻；变柔和；变柔软

to become soft , or to make something soft

Plastics will soften when exposed to heat. 塑料适当加热就可以软化。
This special cream will help to soften up our skin. 这种特殊的护肤霜有助于使皮肤变得柔软。