Ideal engine sound (4)
I believe the answer is:
purr
(Other definitions for purr that I've seen before include "Sound of cat (or engine)" , "Sound of a contented feline" , "Low vibratory sound" , "Cat's noise" , "Cat's coo" .)
I believe the answer is:
purr
(Other definitions for purr that I've seen before include "Sound of cat (or engine)" , "Sound of a contented feline" , "Low vibratory sound" , "Cat's noise" , "Cat's coo" .)