fight like cat and dog: argue constantly 常常吵得不可开交

My brothers used to fight like cat and dog about everything.

Those two fight like cat and dog, so please don't put them together on the project.

a fish out of water: a person in an unfamilar situation 指某人浑身不自在

I feel like a fish out of water in this new job. I'm not sure I'll stay.

When Carla transferred to a new school, she felt like a fish out of water because she didn't know anyone there.

gone/go to the dogs: not as good as before 每况愈下 /大不如前

I used to like this town, but now it's gone to the dogs.

Boy, this party has really gone to the dogs. First, there was the issue with the caterer, and now half the guests aren't coming.