Where does “diluviare” come from?

diluviare (Italian) comes from Latin diluvio, from Latin dīluvium, from Latin dīluō, from Latin dis-, from Latin calceus, from Latin calx, from Ancient Greek χάλιξ — small stone, pebble; gravel, rubble.

diluviare (Italian): to pour (also figurative), to rain cats and dogs, to bucket, to downpour

Definitions

to pour (also figurative), to rain cats and dogs, to bucket, to downpour

Ancestry of “diluviare”, step by step

Step	Language	Word	Meaning
1	Latin	diluvio	flood, deluge, inundation; I inundate, deluge;...
2	Latin	dīluvium	a flood
3	Latin	dīluō	to wash away
4	Latin	dis-	asunder, apart, in two; reversal, removal;...
5	Latin	calceus	shoe
6	Latin	calx	limestone; chalk; the finish line
7	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

Every word from Ancient Greek χάλιξ →Every word from Latin dis- →Every word from Latin calx →