grumble

When you grumble, you complain about something clearly but quietly, in a low mutter. Some people grumble a hundred times a day, about everything from the weather to the traffic to their bad luck at bowling.

The verb grumble is a great example of onomatopoeia, a word that sounds just like what it means. When you say "grumble" out loud, you're practically already grumbling about something. The origin of grumble is the Middle French word grommeler, or "mutter through the teeth." Just think about the things in life that make you want to mutter through your teeth and you'll probably start to grumble.

Definitions of grumble
1

v make complaining remarks or noises under one's breath

“she grumbles when she feels overworked”
Synonyms:
croak, gnarl, murmur, mutter
Type of:
complain, kick, kvetch, plain, quetch, sound off
express complaints, discontent, displeasure, or unhappiness

v make a low noise

Synonyms:
rumble
Type of:
go, sound
make a certain noise or sound

v to utter or emit low dull rumbling sounds

“he grumbled a rude response”
“Stones grumbled down the cliff”
Synonyms:
growl, rumble
Type of:
emit, let loose, let out, utter
express audibly; utter sounds (not necessarily words)

v show one's unhappiness or critical attitude

“We grumbled about the increased work load”
Synonyms:
grouch, scold
Type of:
complain, kick, kvetch, plain, quetch, sound off
express complaints, discontent, displeasure, or unhappiness

n a complaint uttered in a low and indistinct tone

Synonyms:
grumbling, murmur, murmuring, mutter, muttering
Type of:
complaint
an expression of grievance or resentment

n a loud low dull continuous noise

Synonyms:
grumbling, rumble, rumbling
Type of:
noise
sound of any kind (especially unintelligible or dissonant sound)

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