Phase door - an entrance towards the backstage area of theater; employed by performers along with other theater personnel encroachment, intrusion, invasion - any entry into a location not Earlier occupied; "an invasion of travellers"; "an invasion of locusts" maintain - keep the eye of; "The soprano held the viewers"; https://entrance-mats89900.blogsidea.com/44415350/getting-my-entrance-mats-to-work