What does "churr" mean?

Churr: 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.

Additional senses

  1. 2.To make a churr, as a cockchafer. That's the churring of the nightjar. Hall Caine.
  2. 3.To utter by churring.

Sources