- a loud low dull continuous noise
- Stop grumbling.
- Tom is grumbling.
- My stomach is grumbling.
- You're always grumbling.
- She's always grumbling.
- I'm fed up with her grumbling.
- My grandfather was always grumbling about something or other.
- She would often hear him grumbling to himself.
- Certainly she wouldn't have dreamt that I would get up promptly without grumbling.
- Stop your grumbling and get the work out of the way.