'Upper Room' in the Bible

Then Ehud went out into the vestibule and shut the doors of the upper chamber behind him, and locked them.

When Ehud departed, Eglon’s servants came. And when they saw that the doors of the upper room were locked, they said, “He is only relieving himself in the cool room.”

They waited [a very long time] until they became embarrassed and uneasy, but he still did not open the doors of the upper room. So [finally] they took the key and opened them, and behold, their master had fallen to the floor, dead.