Definitionen
1.VerbTo 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."
2.VerbTo enter any information, data etc (into a register, account, record etc).
3.VerbTo establish a position in the frontcourt on one side or the other of the free-throw lane, especially used against smaller defenders.
4.VerbTo occupy a position."I'll post up by the window to look out for him."