Grumble | Mean of grumble in English Dictionary

/ˈgrʌmbəl/

• Verb
• to complain quietly about something
1. There's been a lot of grumbling among the employees.
2. Some of the customers have been grumbling about poor service.
3. Fans grumbled about the team's poor play.
4. “When are we going to leave?” he grumbled.
• to make a low, heavy sound
1. His stomach was grumbling.
2. We could hear thunder grumbling in the distance.