go down (Verb) — Move downward and lower, but not necessarily all the way. ex. "The temperature is going down"
go down (Verb) — Go under. ex. "The raft went down and its occupants drowned"
go down (Verb) — Grow smaller. ex. "Interest in the project went down"
go down (Verb) — Be recorded or remembered. ex. "She will go down as the first feminist"
go down (Verb) — Be ingested. ex. "This wine sure goes down well" ex. "The food wouldn't go down"
go down (Verb) — Be defeated. ex. "If America goes down, the free world will go down, too"
go down (Verb) — (astronomy) go down below the surface (esp. of water) to become submerged. ex. "the sun goes down early these days"
go down (Verb) — Stop operating. ex. "The system goes down at least once a week"
go down (Noun) — (in India and Malaysia) a warehouse.