cock-upUKslang
He was in danger of making a real cock-up of this.
If I do make a cock-up of it, I can buy a replacement.
It's not fair that wealthy executives are receiving huge rewards for making a glaring cock-up of things.

SMART Vocabulary: related words and phrases

Making mistakes
balls
balls (something) up
blunder
blunderingly
bodge
making
misdiagnose
misdiagnosis
misdirect
misdirection
misremember
misrender
misstate
mistake
mistranscribe
stumbling
stumblingly
to err is human (to forgive divine).idiom
trip (someone) up
uncorrectable