post up

Verb

 * 1) To affix a notice, announcement etc, to a post, board, wall or the like.
 * If the bailiff does not find the witness at his home, he will post up a court warrant there instead.
 * 1) To enter any information, data etc (into a register, account, record etc).
 * 2)  To establish a position in the frontcourt on one side or the other of the free-throw lane, especially used against smaller defenders.
 * 3) To occupy a position.
 * I'll post up by the window to look out for him.