knock something into a cocked hat

tv. to demolish a plan, a story, etc. You’ve knocked everything into a cocked hat.

Name	Pronounced	Usage
LiÙSaidh	-	Scottish
Murron	-	Scottish
Slater	['sleitə]
Diede	DEE-də	Dutch
Drystan	-	Welsh
Iago	ee-A-gaw (Welsh, Galician), ee-AH-go (English)	Welsh, Galician, Portuguese