1. (verb) close up, close, fold, shut down, close down
cease to operate or cause to cease operating
Synonyms: block, come together, pen up, belt up, shut, button up, fill up, impede, conclude, be quiet, dummy up, clam up, close up, keep mum, close, close down, obstruct, fold, obturate, turn up, shut down, fold up, shut up, jam, occlude
Antonyms: open up
2. (verb) obstruct, obturate, impede, occlude, jam, block, close up
block passage through
Synonyms: immobilize, close, button up, fold, block up, crush, lug, halt, ram, obturate, jam, pile, pack, block off, close up, blank out, mob, freeze, obstruct, deflect, parry, stop, embarrass, shut up, kibosh, draw a blank, hinder, impede, block, clam up, forget, chock up, throng, stuff, stymy, blockade, immobilise, bar, be quiet, occlude, barricade, dummy up, cram, wad, keep mum, choke up, jampack, stymie, shut down, belt up, close down
Antonyms: open up
3. (verb) close up, close
unite or bring into contact or bring together the edges of
Synonyms: block, come together, belt up, shut, button up, fill up, impede, conclude, be quiet, dummy up, clam up, close up, keep mum, close, close down, obstruct, fold, obturate, shut down, shut up, jam, occlude
Antonyms: open up
4. (adverb) close up, clam up, dummy up, shut up, belt up, button up, be quiet, keep mum
refuse to talk or stop talking; fall silent
Synonyms: block, shut away, belt up, hush, button up, dummy, impede, lock away, lock up, hush up, be quiet, still, dummy up, clam up, close up, keep mum, close, close down, obstruct, put away, lock in, fold, obturate, lock, shut down, quieten, shut up, jam, silence, occlude
Antonyms: open up
5. (adverb) close up, at close range
very close
Synonyms: close up, at close range
Antonyms: open up
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Synonyms for close up 
