When the engine of a machine such as a car purrs, it is working and making a quiet, continuous, vibrating sound. Both boats purred out of the cave mouth and into open water Purr is also a noun. Carmela heard the purr of a motor-cycle coming up the drive
When a cat purrs, it makes a low vibrating sound with its throat because it is contented. The plump ginger kitten had settled comfortably in her arms and was purring enthusiastically