purr / pər/ • v. [intr.] (of a cat) make a low continuous vibratory sound usually expressing contentment. ∎ (of a vehicle or machine) make such a sound when running smoothly at low speed. ∎ [intr.] (of a vehicle or engine) move smoothly while making such a sound: a sleek blue BMW purred past him. ∎ speak in a low soft voice, esp. when expressing contentment or acting seductively: [with direct speech] “Would you like coffee?” she purred | [tr.] she purred her lines seductively. • n. a low continuous vibratory sound, typically that made by a cat or vehicle.