Phase door - an entrance towards the backstage place of theater; utilized by performers together with other theater personnel encroachment, intrusion, invasion - any entry into a region not Beforehand occupied; "an invasion of holidaymakers"; "an invasion of locusts" maintain - maintain the attention of; "The soprano held the audience"; https://titushzodq.tkzblog.com/37553113/the-basic-principles-of-entrance-mats