Where does “aguafiestas” come from?

aguafiestas (Spanish) comes from Spanish fiesta, from Old Spanish fiesta, from Latin fēsta, from Latin festum, from Latin fēstus, from Proto-Italic fēstos.

aguafiestas (Spanish): party pooper, wet blanket, spoilsport, killjoy

Definitions

party pooper, wet blanket, spoilsport, killjoy

Ancestry of “aguafiestas”, step by step

aguafiestas traces back through two separate lines of ancestry.

via Spanish fiesta

Step	Language	Word	Meaning
1	Spanish	fiesta	party; feast; feast day
2	Old Spanish	fiesta	party
3	Latin	fēsta	party, feast
4	Latin	festum	a holiday, festival; a banquet, feast
5	Latin	fēstus	Of or pertaining to holidays; festive, festal, joyful, merry
6	Proto-Italic	fēstos	—

via Spanish aguar

Step	Language	Word	Meaning
1	Spanish	aguar	to water down, dilute
2	Spanish	agua	water; body of water; rain
3	Old Spanish	agua	water
4	Latin	aqua	water
5	Proto-Italic	akʷā	water
6	Proto-Indo-European	h₂ekʷeh₂	water, flowing water

Every word from Proto-Italic fēstos →Every word from Latin fēstus →Every word from Latin festum →