Where does “underskrive” come from?

underskrive (Norwegian Bokmål) comes from Norwegian Bokmål skrive, from Old Norse skrifa, from Proto-Germanic skrībaną, from Latin scrībō, from Proto-Italic skreiβō, from Proto-Indo-European skreybʰ- — to write.

underskrive (Norwegian Bokmål): to sign

Definitions

to sign

Ancestry of “underskrive”, step by step

underskrive traces back through two separate lines of ancestry.

via Norwegian Bokmål skrive

Step	Language	Word	Meaning
1	Norwegian Bokmål	skrive	to write
2	Old Norse	skrifa	—
3	Proto-Germanic	skrībaną	to write
4	Latin	scrībō	to write
5	Proto-Italic	skreiβō	to carve
6	Proto-Indo-European	skreybʰ-	to write

via Norwegian Bokmål under

Step	Language	Word	Meaning
1	Norwegian Bokmål	under	below; beneath; during; under
2	Old Norse	undir	under, underneath
3	Proto-Germanic	under	among, between; under, beneath; under
4	Proto-Indo-European	h₁entér	between
5	Proto-Indo-European	h₁en	in; in, inside

Every word from Proto-Indo-European skreybʰ- →Every word from Proto-Italic skreiβō →Every word from Latin scrībō →