Behind closed doors and Under-the-table

Under-the-table and behind closed doors are semantically related. In some cases you can replace phrase "Under-the-table" with "Behind closed doors", this phrases are similar.

Under-the-table adjective - Designed and carried out secretly or confidentially.

Behind closed doors and under-the-table are semantically related. Sometimes you can use "Behind closed doors" instead an adverb phrase "Under-the-table".