close up in WordNet English dictionary

1. very close
   "without my reading glasses I can hardly see things close up"; "even firing at close range he missed"
   close up  at close range  close up  at close range 
   

1. refuse to talk or stop talking; fall silent
   "The children shut up when their father approached"
   close up  clam up  dummy up  shut up  belt up  button up  be quiet  keep mum 
   
2. block passage through
   "obstruct the path"
   obstruct  obturate  impede  occlude  jam  block  close up 
   
3. unite or bring into contact or bring together the edges of
   "close the circuit"; "close a wound"; "close a book"; "close up an umbrella"
   close up  close 
   
4. cease to operate or cause to cease operating
   "The owners decided to move and to close the factory"; "My business closes every night at 8 P.M."; "close up the shop"
   close up  close  fold  shut down  close down 
   

close up in English Wiktionary