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Adjective up has 8 senses
up - being or moving higher in position or greater in some value; being above a former position or level; "the anchor is up"; "the sun is up"; "he lay face up"; "he is up by a pawn"; "the market is up"; "the corn is up"Antonyms:  down, behind, trailing, downbound, downcast, downfield, downward, fallen, set, thrown
 
improving, up - getting higher or more vigorous; "its an up market"; "an improving economy"Antonym:  falling (indirect, via rising)
 
up, upward - extending or moving toward a higher place; "the up staircase"; "a general upward movement of fish"Antonym:  descending (indirect, via ascending)
 
up - (usually followed by `on' or `for') in readiness; "he was up on his homework"; "had to be up for the game"Antonym:  unprepared (indirect, via prepared)
 
up - open; "the windows are up"Antonym:  lowered (indirect, via raised)
 
up - (used of computers) operating properly; "how soon will the computers be up?"Antonyms:  malfunctioning, nonfunctional (indirect, via functioning)
 
up - used up; "time is up"Antonym:  unfinished (indirect, via finished)
 
astir, up - out of bed; "are they astir yet?"; "up by seven each morning"Antonym:  asleep (indirect, via awake)
 
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