(Dedicated to Anna)
If you take the chair, you take the ruling role in a meeting.
In UK and USA, the word Chairman was originally used for men and women. Later, Chairwoman was also used, then, Chairperson. Finally, in the most PC (politically correct) form, it became just 'Chair.'
If somebody talks in a meeting without asking the permission of the 'Chair', somebody might say, 'please talk through the chair!'
The most famous chair on British TV was in the general knowledge quiz called Mastermind.
In this very clever comedy sketch (like a very short play), the contestant (person answering the questions) answers the question before last. So that it not the one being asked now but one question before. Confused? You will be!