# have a cob on

> English word · Verb

## Definitions
1. To be in a bad mood; be grumpy.

## Etymology
Unknown. Perhaps from cob (“male swan”), noted for its ill-temper. Compare have a corncob up one's arse (“to be ill-tempered”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/have-a-cob-on