Pronunciation

change

Plain form
grumble

Third-person singular
grumbles

Past tense
grumbled

Past participle
grumbled

Present participle
grumbling

  1. When you grumble you complain about something.
    Don't grumble about it.

Singular
grumble

Plural
grumbles

  1. A grumble is a complaint.
    I do not want to hear another grumble.