close has 36 distinct synonyms spread across 21 of its 37 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 2 recorded opposites are open, distant.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
complete a business deal, negotiation, or an agreement
“We closed on the house on Friday”
be priced or listed when trading stops
“The stock market closed high this Friday”
engage at close quarters
“close with the enemy”
change one's body stance so that the forward shoulder and foot are closer to the intended point of impact
come together, as if in an embrace
“Her arms closed around her long lost relative”
draw near
“The probe closed with the space station”
bring together all the elements or parts of
“Management closed ranks”
bar access to
“Due to the accident, the road had to be closed for several hours”
finish a game in baseball by protecting a lead
“The relief pitcher closed with two runs in the second inning”
the temporal end; the concluding time
“the stopping point of each round was signaled by a bell”
4 of the 37 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for close.
Synonyms, antonyms and the broader and narrower relations for close come from Princeton University’s WordNet. Full sources and licences.
giving or spending with reluctance
“our cheeseparing administration”
inclined to secrecy or reticence about divulging information
“although they knew her whereabouts her friends kept close about it”
the last section of a communication
“in conclusion I want to say...”