behind the scenes

In private or in secret. The term comes from the the- ater, where, in the seventeenth and eighteenth centuries, violent action such as a murder or execution generally took place backstage (behind the scenery). The English journalist Joseph Addison pointed out, in 1711, that this practice was followed particularly in the French theater. By the late eighteenth century the expression was used figuratively for any activity that took place out of the public eye.