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The boy was seen to stiffen and then to fall from the tree.
人们看到男孩蹬了一下腿，然后从树上掉了下来。
youdao
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The blood supply to the skin is reduced when muscles stiffen.
肌肉发僵时，皮肤的供血量就会减少。
《柯林斯英汉双解大词典》
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To cause to stand erect like bristles; stiffen.
使…僵硬使…象刚毛一样直立；
youdao
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To cause to stand erect like bristles; stiffen.
使…僵硬使…象刚毛一样直立；
youdao