I. ˈgrəmp noun
Etymology: obsolete English grumps snubs, slights
Date: 1844
1. : a fit of ill humor or sulkiness — usually used in plural
2. : a person given to complaining
II. verb
Date: 1875
intransitive verb
1. : sulk
2. : grumble , complain
transitive verb
: to utter in a grumpy manner