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испортить всё дело stresses
gen.	make a mess of things; make sad work of; play old gooseberry
idiom.	mess up the contract (Andrey Truhachev)
Makarov.	make a sad mess of the affair; make sad work of something; make sad work of something, to make a sad mess of the affair; make a hash of a job; make a mess of a job; make sad work of something, to to make a sad mess of the affair; mess the whole business; mess up the whole business; muck a job; muck up a job
slang	gum up the works

испортить всё дело: 8 phrases in 3 subjects

British usage, not spelling	1
General	5
Makarov	2