to make a low, hoarse noise in the throat, as a frog, a raven, or a crow; hence, to make any hoarse, dismal sound.-to complain; especially, to grumble; to forebode evil; to utter complaints or forebodings habitually.-to utter in a low, hoarse voice; to announce by croaking; to forebode; as, to croak disaster.-the coarse, harsh sound uttered by a frog or a raven, or a like sound.