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Definition of Post up
1. Verb. To affix a notice, announcement etc, to a post, board, wall or the like. ¹
2. Verb. To enter any information, data etc (into a register, account, record etc). ¹
3. Verb. (basketball) To establish a position in the frontcourt on one side or the other of the free throw lane, especially used against smaller defenders. ¹
¹ Source: wiktionary.com