croak 
(krōk)
(krōk)n.
A low hoarse sound, as that characteristic of a frog or a raven.
v. croaked, croak·ing, croaks
v.tr.
1. To utter in a low hoarse sound.
2. Slang To kill.
v.intr.
1.
a. To utter a low hoarse sound.
b. To speak with a low hoarse voice.
2. To mutter discontentedly; grumble.
3. Slang To die.
[From Middle English croken, to croak, probably of imitative origin.]
croaki·ly adv.
croaky adj.