make a dog's breakfast (of something)

To make a mess of or completely ruin something. I thought I could trust Jim to finish the business proposal, but he made a dog's breakfast of the whole thing.

Common Names:

Name	Pronounced	Usage
Alaina	ə-LAYN-ə	English (Modern)
Emmerich	E-me-rikh (German)	German, Ancient Germanic
Milivoj	MEE-lee-voi (Croatian, Serbian)	Croatian, Serbian, Slovene, Medieval Slavic
Demelza	-	English (British)
Chryses	-	Greek Mythology
Urban	UWR-bahn (Polish), UR-bən (English)	Danish, Swedish, German, Polish, Slovene, Biblical, History