Meaning of “purr” - Learner’s Dictionary

purr

verb [ I ] uk us /pɜːr/
CAT

If a cat purrs, it makes a soft sound in its throat to show pleasure.

PERSON

to talk in a soft, low voice

CAR

If a car purrs, its engine is very smooth and makes a soft sound.

(Definition of “purr” from the Cambridge Learner’s Dictionary © Cambridge University Press)