a hoarse/rough sound similar to grunting or snorting, sometimes made by a person's breathing when they are asleep, or the action or instance of someone making such a sound;
e.g. I heard a snore from him, and wondered how long he had been asleep.
(noun)
(informal) something that is boring enough to figuratively make one fall asleep;
e.g. Most of her speech was a snore, but she told some funny stories at the end.
(verb)
to make a hoarse/rough grunting or snorting sound when breathing while asleep;
e.g. You fell asleep and started to snore about half an hour into the movie.