croak in WordNet English dictionary

1. a harsh hoarse utterance (as of a frog)
   croak  croaking 
   

1. make complaining remarks or noises under one's breath
   "she grumbles when she feels overworked"
   murmur  mutter  grumble  croak  gnarl 
   
2. utter a hoarse sound, like a raven
   croak  cronk 
   
3. 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"
   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