expression, noun, noun which may take the genitive case particle 'no'
godsend; lifesaver; timely help; windfall
Idiomatic expression meaning a piece of good luck or a helpful coincidence that arrives just when needed, like a boat appearing when you need to cross a river.
It's a godsend that he's going to help me.
This job offer was truly a timely piece of luck.
Both describe a savior in a difficult situation, but 渡りに船 is a broader metaphor for any timely assistance, whereas 地獄で仏 specifically implies a kind person appearing in a harsh environment.
Standard kanji spelling.
Variant using 舟, which also means 'boat'.
Literally 'a boat at the crossing'. The phrase originates from the idea that when you need to cross a river, a boat conveniently appears, symbolizing a timely and fortunate coincidence.