1. made a low, continuous, vibrating sound (as a cat does when content)
2. spoke in a soft, smooth, pleased manner
3. made a low, smooth, continuous sound (of an engine or machine)

Examples

• The cat purred contentedly on my lap.
• The engine purred smoothly as we drove down the highway.
• She purred with satisfaction after receiving the compliment.
• The luxury car’s motor purred quietly at the stoplight.
• He purred sweet words into her ear.
• The kitten purred loudly when I scratched behind its ears.
• The well-tuned machine purred efficiently throughout the day.