Where does “birdsome” come from?

birdsome (English) comes from English some, from Middle English som, from Old English sum, from Proto-West Germanic *sum, from Proto-Germanic sumaz, from Proto-Indo-European sem- — together, one.

birdsome (English): Flying, like a bird; Free, lofty, liberated

Definitions

Flying, like a bird; Free, lofty, liberated

Ancestry of “birdsome”, step by step

birdsome traces back through two separate lines of ancestry.

via English some

Step	Language	Word	Meaning
1	English	some	A certain number, at least two; An indefinite...
2	Middle English	som	some
3	Old English	sum	some
4	Proto-West Germanic	*sum	some
5	Proto-Germanic	sumaz	some (one), a certain (one)
6	Proto-Indo-European	sem-	together, one

via English bird

Step	Language	Word	Meaning
1	English	bird	A member of the class of animals Aves in the...
2	Middle English	brid	a young bird, a bird in general; Alternative form...
3	Old English	bridd	young bird, chick; chicken

Every word from Proto-Indo-European sem- →Every word from Proto-Germanic sumaz →Every word from Proto-West Germanic *sum →