Italian word tramonto comes from Italian tramontare

Detailed word origin of tramonto

Dictionary entry	Language	Definition
tramontare	Italian (ita)	(singulare tantum) sunset, sundown, setting (intransitive, figuratively) to fade, wane. (intransitive, of the sun, moon, stars) to set, go down, sink.
tramonto	Italian (ita)	(also, _, figuratively) sunset, sundown. (figuratively) fall, decline. Setting.