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начать за здравие, а кончить за упокой stresses
gen.	start on a merry note, but finish on a sad one (Anglophile); give a bad ending to a good start (Anglophile); damn with faint praise (Anglophile); start with a bang and end with a fizzle (Moscowtran); start something well and end badly (Anglophile)
Gruzovik, obs.	start well and end badly; start cheerfully and end sadly
начать за здравие о ~и, а кончить за упокой
inf.	but finish on a sad one; start on a merry note; start well and end badly

начать за здравие, а кончить за упокой: 2 phrases in 1 subject

Informal

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