Machine's low-pitched noise (5)
I believe the answer is:
bloop
(Other definitions for bloop that I've seen before include "Howling sound on radio" , "Effect of a howler in audio" .)
I've seen this clue in the USA Today.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.