make complaining remarks or noises under one's breath; "she grumbles when she feels overworked"
To utter in a low, hoarse voice; to announce by croaking; to forebode; as, to croak disaster
If someone croaks something, they say it in a low, rough voice. Tiller moaned and managed to croak, `Help me.' She croaked something unintelligible. Croak is also a noun. His voice was just a croak
When a frog or bird croaks, it makes a harsh, low sound. Thousands of frogs croaked in the reeds by the riverbank. Croak is also a noun. the guttural croak of the frogs