Churr
Churr , noun
[Compare Chirr.]
A vibrant or whirring noise such as that made by some insects, as the cockchafer, or by some birds, as the nightjar, the partridge, etc.
Churr , intransitive verb
To make a churr, as a cockchafer.
That's the churring of the nightjar.
Churr , transitive verb
To utter by churring.