post up verb 4post-up noun 1forms 4 verb4 •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. •To establish a position in the frontcourt on one side or the other of the free-throw lane, especially used against smaller defenders. •To occupy a position.I'll post up by the window to look out for him. •To enter any information, data etc (into a register, account, record etc). post-up noun1 •The process of posting up. formsposted up · posting up · posts up · post-ups