post up

/P OW1 S T AH0 P/
verb
  1. 1

    To affix a notice, announcement etc, to a post, board, wall or the like.

    โ€œIf the bailiff does not find the witness at his home, he will post up a court warrant there instead.โ€

  2. 2

    To enter any information, data etc (into a register, account, record etc).

  3. 3

    To establish a position in the frontcourt on one side or the other of the free throw lane, especially used against smaller defenders.

Source: https://en.wiktionary.org/wiki/post%20up