1
general::
1. Up for discussion, as in There are two new proposals on the table. [Mid-1600s] 2. Postponed or put aside for later consideration, as in When they adjourned, three items were put on the table until the next meeting. [First half of 1700s] The table in both idioms is a figurative conference table. Also see LAY ONE'S CARDS ON THE TABLE.
American Heritage Idioms
2
general::
Phrase(s): on the table
Fig. subject to discussion by the group; submitted as a point of discussion. • The chairman said we could not discuss salaries since the topic was no longer on the table.
McGrawhill's American Idioms And Phrasal Verbs