Main entry: go down, come down, fall, descend
Definition: move downward and lower, but not necessarily all the way
Usage: The temperature is going down; The barometer is falling; The curtain fell on the diva; Her hand went up and then fell again
Antonyms: lift, come up, rise, move up, go up, arise, uprise
Definition: move upward
Definition: travel up, "We ascended the mountain"
Main entry: set, go down, go under
Definition: disappear beyond the horizon
Usage: the sun sets early these days
Main entry: sink, settle, go down, go under
Definition: go under, "The raft sank and its occupants drowned"
Definition: be afloat either on or below a liquid surface and not sink to the bottom