Where does “walet sarang gua” come from?

walet sarang gua (Indonesian) comes from Indonesian gua, from Malay gua, from Sanskrit गुहा, from Sanskrit गुह्, from Proto-Indo-Iranian gʰawȷ́ʰ- — to hide, conceal.

walet sarang gua (Indonesian): Germain's swiftlet; Aerodramus fuciphagus germani

Definitions

Germain's swiftlet; Aerodramus fuciphagus germani

Ancestry of “walet sarang gua”, step by step

walet sarang gua traces back through 3 separate lines of ancestry.

via Indonesian gua

Step	Language	Word	Meaning
1	Indonesian	gua	cave; "First-person singular pronoun": I, me, my
2	Malay	gua	I, me, my; cave; "First-person singular pronoun":...
3	Sanskrit	गुहा	hiding place, cave, cavern
4	Sanskrit	गुह्	a hiding place, cave, den, lair
5	Proto-Indo-Iranian	gʰawȷ́ʰ-	to hide, conceal

via Indonesian sarang

Step	Language	Word	Meaning
1	Indonesian	sarang	nest
2	Malay	sarang	nest
3	Proto-Malayo-Polynesian	*salaʀ	—

via Indonesian walet

Step	Language	Word	Meaning
1	Indonesian	walet	swallow, martin

Every word from Proto-Indo-Iranian gʰawȷ́ʰ- →Every word from Sanskrit गुह् →Every word from Sanskrit गुहा →