Where does “kubbetrapp” come from?

kubbetrapp (Norwegian Bokmål) comes from Norwegian Bokmål trapp, from Middle Low German trappe, from Old Saxon *trappa, from Proto-West Germanic *trappā — staircase, stairs.

kubbetrapp (Norwegian Bokmål): a ladder made of a single tree stem by cutting the stairs in it

Definitions

a ladder made of a single tree stem by cutting the stairs in it

Ancestry of “kubbetrapp”, step by step

kubbetrapp traces back through two separate lines of ancestry.

via Norwegian Bokmål trapp

Step	Language	Word	Meaning
1	Norwegian Bokmål	trapp	stairs, stairway, staircase, steps
2	Middle Low German	trappe	stair, step
3	Old Saxon	*trappa	—
4	Proto-West Germanic	*trappā	staircase, stairs

via Norwegian Bokmål kubbe

Step	Language	Word	Meaning
1	Norwegian Bokmål	kubbe	a log, (a bulky piece of wood used as firewood)
2	Middle Norwegian	kubbi	—

Every word from Proto-West Germanic *trappā →Every word from Old Saxon *trappa →Every word from Middle Low German trappe →