make a dog's dinner (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 dinner of the whole thing!

Common Names:

Name	Pronounced	Usage
FrantiŠKa	-	Czech
Patterson	['pætəsən]
Filip	FEE-lip (Dutch), FEE-leep (Polish, Finnish)	Swedish, Norwegian, Danish, Dutch, Czech, Slovak, Bulgarian, Polish, Croatian, Serbian, Slovene, Mac
Maeleachlainn	-	Ancient Irish
Angell	['eindʒəl]
Donald	DAHN-əld (English)	Scottish, English