Phase door - an entrance on the backstage region of theater; utilized by performers along with other theater staff encroachment, intrusion, invasion - any entry into a place not Beforehand occupied; "an invasion of vacationers"; "an invasion of locusts" maintain - maintain the eye of; "The soprano held the audience"; https://entrance-mats67889.blogrelation.com/44243075/what-does-entrance-mats-mean