Pronunciation change

Verb 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.

Noun change

Singular
grumble

Plural
grumbles

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