Come hell or high water.
More Hungarian Proverbs:
Even you are not better than the linen of Deak's wife.Hungarian
Nobody is forced to attend the dinner given after killing a pig.
Hungarian
You try to trade at a deserted place.
Hungarian
Property gained unlawfully will be lost in the same way.
Hungarian
He got into this affair like Pilate into the Credo.
Hungarian
He who greets with a stick, will be answered with a club.
Hungarian