Get a cob on British informal verb phrase mainly UK
To get anxious, furious, or annoyed.
I didn't know why she suddenly got a cob on and lashed out at other children.
He got a cob on when he found out about their plots.
She got a cob on over the way she had been tricked
To argue with somebody
1. Become angry or lose self-control
2. To plunge into the deep part of a pool
To look or glare very angrily at someone
A deliberate provocation will surely result in an adverse reaction such as angry and violent actions.
The verb "get" should be conjugated according to its tense.