It rained cats and dogs and, look, I am wet as a drowned rat.
When I got home, I had been poured into a drowned rat. My sister was laughing and crying, but I was very happy because I had snatched the last book.
I had to cycle home in the rain and came in looking like a drowned rat.
Stephen: Wow, you look like a drowned rat! Didn't you know there's a thunderstorm today?
It was raining dogs and cats when he came home, so he looked like a drowned rat.
He was wet all over like a drowned rat.