a browned rat

一只棕色的老鼠
你是不是写错了啊，应该是 a drowned rat
look like a drowned rat
to be very wet, especially because you have been in heavy rain. I had to cycle home in the rain and came in looking like a drowned rat.
形容被大雨淋湿的样子，在中国我们是用落汤鸡描述的