Where does “rautasänky” come from?

rautasänky (Finnish) comes from Finnish sänky, from Swedish säng, from Old Swedish siang, from Old Norse sæing, from Old Norse sæng — a late variant of sæing.

rautasänky (Finnish): iron bed, iron bedframe

Definitions

iron bed, iron bedframe

Ancestry of “rautasänky”, step by step

rautasänky traces back through two separate lines of ancestry.

via Finnish sänky

Step	Language	Word	Meaning
1	Finnish	sänky	bed, bedstead; sex, especially in the expressions...
2	Swedish	säng	a bed; a piece of furniture used for sleeping
3	Old Swedish	siang	—
4	Old Norse	sæing	bed
5	Old Norse	sæng	a late variant of sæing

via Finnish rauta

Step	Language	Word	Meaning
1	Finnish	rauta	iron; shackles, irons; act of getting or state of...
2	Proto-Finnic	rauta	iron

Every word from Old Norse sæng →Every word from Old Norse sæing →Every word from Old Swedish siang →