be swimming with the fishes イディオム
Swim with the fishes
If someone is swimming with the fishes, they are dead, especially if they have been murdered. 'Sleep with the fishes' is an alternative form.
be pond with the fishes
gangster cliché To be murdered and accept one's anatomy disposed of in a river, lake, or ocean. (A beneath accepted alternative of "be sleeping with the fishes.") Don't worry, boss, that abject annex will be pond with the fishes afore sunrise.Learn more: Fishes, swimming