Meaning of yū:
瘀
hematoma (internal blood clot); extravasated blood (spilt into surrounding tissue); contusion
Tā shuāidǎo hòu, tuǐ shàng yǒu yīgè xiǎo de yū shāng.
他摔倒后,腿上有一个小的瘀伤。
After he fell, he had a small bruise on his leg.
Tā diēdǎo hòu, tuǐ shàng chūxiànle yīgè hěn dà de yūxuè.
他跌倒后,腿上出现了一个很大的瘀血。
After he fell, a large bruise appeared on his leg.
Tā shuāi le yī jiāo, tuǐ shàng yǒu gè dà dà de yū shāng.
他摔了一跤,腿上有个大大的瘀伤。
He fell and got a big contusion on his leg.