“Like a cat on a hot tin roof” means “very nervous”. Example: The actor was like…
“Break your duck” means “to do something for the first time”. Example: No matter how hard I try, I can’t catch a fish when I go fishing. I really hope I break my duck tomorrow. Get our apps for learning English: learzing.com
“Drink like a fish” means “to drink too much alcohol”. Example: Jenny had two bottles of wine with her meal - that girl drinks like a fish!
“Have ants in your pants” means “to be very excited or worried about something”. Example: She has ants in her pants because she’s going to a party tonight.
“Like water off a duck’s back” means “without any apparent effect”. Example: She calls him lazy and useless, but it’s like water off a duck’s back.