Where does “magkusang-loob” come from?

magkusang-loob (Tagalog) comes from Tagalog mag-, from Tagalog sibuyas, from Spanish cebolla, from Old Spanish cebolla, from Late Latin cepulla, from Latin cēpa — onion.

magkusang-loob (Tagalog): to do voluntarily; to volunteer

Definitions

to do voluntarily; to volunteer

Ancestry of “magkusang-loob”, step by step

Step	Language	Word	Meaning
1	Tagalog	mag-	actor trigger: to do something; actor trigger: to...
2	Tagalog	sibuyas	onion
3	Spanish	cebolla	onion
4	Old Spanish	cebolla	onion
5	Late Latin	cepulla	onion-bed, onion-field; small onion
6	Latin	cēpa	onion

Every word from Latin cēpa →Every word from Tagalog mag- →Every word from Late Latin cepulla →