Driving stiffens up the knees.开车使膝盖变得僵硬。

These clothes restrict freedom of movement and stiffen up the whole body.这些衣服使你行动不便, 让你全身都变得不灵活。

I just stiffened up.我浑身都僵直了。

His knee has stiffened up overnight.他的膝盖在一夜之间变得僵硬起来。

My elbow was starting to stiffen up where I'd landed on it.我用胳膊肘支撑着自己, 结果着力的地方就开始变得僵硬起来。

The battered muscles were starting to stiffen up.遭到重击的肌肉开始变得僵硬起来。