名詞 croak:

1. a harsh hoarse utterance (as of a frog)
   同義詞：croaking

動詞 croak:

1. pass from physical life and lose all bodily attributes and functions necessary to sustain life
   同義詞：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, snuff it
2. utter a hoarse sound, like a raven
   同義詞：cronk
3. make complaining remarks or noises under one's breath
   同義詞：murmur, mutter, grumble, gnarl

1. He sat on the playground listening to the distant croak.
   他坐在操場上，聆聽遠處的蛙鳴。
2. A bullfrog was croaking in the distance.
   一只牛蛙在遠處呱呱地叫。

croak

n.（名詞）
A low, hoarse sound, as that characteristic of frogs and crows.
呱呱叫：一種低而嘶啞的聲音，如蛙和鴉發(fā)出的叫聲
v.（動詞）
croaked,croak.ing,croaks
v.tr.（及物動詞）
To utter in a low, hoarse sound.
低啞地說：用低而嘶啞的聲音說
Slang To kill.
【俚語】 殺死
v.intr.（不及物動詞）

To utter a low, hoarse sound.
發(fā)低啞聲：發(fā)出低而嘶啞的聲音
To speak with a low, hoarse voice.
低啞地說：用低而嘶啞的聲音說話
To mutter discontentedly; grumble.
不滿地嘀咕；發(fā)牢騷
Slang To die.
【俚語】 死去

來源：
From Middle English croken [to croak]
源自 中古英語 croken [呱呱地叫]
[probably of imitative origin]
[可能源于象聲詞]

【引伸】
croak.ily
adv.（副詞）
croak.y
adj.（形容詞）