Dictionary.net

move downward and lower, but not necessarily all the way; "The temperature is going down"; "The barometer is falling"; "The curtain fell on the diva"; "Her hand went up and then fell again"

be defeated; "If America goes down, the free world will go down, too"

be ingested; "This wine sure goes down well"; "The food wouldn't go down"

go under, "The raft sank and its occupants drowned"

disappear beyond the horizon; "the sun sets early these days"

move downward and lower, but not necessarily all the way; "The temperature is going down"; "The barometer is falling"; "The curtain fell on the diva"; "Her hand went up and then fell again"

be defeated; "If America goes down, the free world will go down, too"

be ingested; "This wine sure goes down well"; "The food wouldn't go down"

go under, "The raft sank and its occupants drowned"