Etymology: (1325–75; ME crouken, prob. imit.; cf. OE cræcetian (of a raven) to croak)
Definition of 'croak'
Princeton's WordNet
1. (verb)croak, croaking a harsh hoarse utterance (as of a frog)
2. (verb)die, decease, perish, go, exit, pass away, expire, pass, kick the bucket, cash in one's chips, buy the farm, conk, give-up the ghost, drop dead, pop off, choke, croak, snuff it pass from physical life and lose all bodily attributes and functions necessary to sustain life "She died from cancer"; "The children perished in the fire"; "The patient went peacefully"; "The old guy kicked the bucket at the age of 102"
3. (verb)croak, cronk utter a hoarse sound, like a raven
4. (verb)murmur, mutter, grumble, croak, gnarl make complaining remarks or noises under one's breath "she grumbles when she feels overworked"