When someone who is asleep snores, they make a loud noise each time they breathe. His mouth was open, and he was snoring. Snore is also a noun. Uncle Arthur, after a loud snore, woke suddenly. to breathe in a noisy way through your mouth and nose while you are asleep (From the sound)
the act of snoring or producing a snoring sound the rattling noise produced when snoring breathe noisily during one's sleep; "she complained that her husband snores