slang definition of croak
(intransitive) To make a croak. (transitive) To utter in a low, hoarse voice. Shakespeare The raven himself is hoarse, / That croaks the fatal entrance of Duncan. (intransitive, of a frog, toad, raven, or various other birds or animals) To make its cry. (slang) To die. (transitive, slang) To kill someone or something. He'd seen my face, so I had to croak him. G. K. Chesterton If Wilton croaked the criminal he did a jolly good day's work, and there's an end of it. To complain; especially, to grumble; to forebode evil; to utter complaints or forebodings habitually.