|Origin:||Probably from Old French grommeler, from Middle Dutch grommen|
1 [intransitive and transitive]
to keep complaining in an unhappy way [= moan]
Farmers are always grumbling about the weather.
A few passengers grumbled that their cabins were too small.
'This is boring,' Kathleen grumbled.
to make a low continuous sound [= rumble]:
Thunder grumbled overhead.
3 British English spoken
used to say that you are fairly healthy and happy:
'How are you today?' 'Mustn't grumble.'
—grumble noun [countable]
the usual grumbles about pay