Darla: Oh, is Tom out sick?
Jane: You haven't heard? He got in an accident last night.
Darla: Was he drunk driving?
Jane: Yeah, how'd you guess.
Darla: I mean, he did drink like a fish. It was only a matter of time.
Meaning: The expression "to drink like a fish" means to excessively drink alcohol frequently. The expression is not used for someone who drinks on occasion (even if they get very drunk when they do drink), but rather, someone who drinks nearly every day.
Frances: I need to take it easy this weekend.
James: Why? You don't want to go out?
Frances: No, I've been going out too much. I think I've gone every night this month, and I've been drinking like a fish. I think I need to just chill and get some rest.
James: OK, but we're going out, so if you change your mind, you know where to find us!
Frances: The bar?
James: Of course!
Frances: You have fun. I'll stay in.
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