What it means

1. adverb very close
   “without my reading glasses I can hardly see things close up”
2. verb refuse to talk or stop talking
   “The children shut up when their father approached”
3. verb unite or bring into contact or bring together the edges of
   “close the circuit”
4. verb cease to operate or cause to cease operating
   “The owners decided to move and to close the factory”
5. verb block passage through
   “obstruct the path”