Engine noise (4)
'engine noise' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for vroom that I've seen before include "Fast revving sound" , "Sound of a car speeding away" , "(Of engine) make roaring sound (colloq.)" , "Exclamation imitating a revving car" , "loud engine noise" .)
'engine noise' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for purr that I've seen before include "Cat noise" , "Noise of a contented feline" , "Sound of contentment" , "Express contentment" , "Satisfaction from queen" .)
'engine noise' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ping that I've seen before include "Sharp ringing sound" , "Abrupt high-pitched ringing sound" , "Short high-pitched sound" .)
'engine noise' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hum that I've seen before include "Make music through closed lips" , "Smell strongly" , "Murmur" , "Low sound of bad smell?" , "Low continuous sound" .)