References in common literature ? I gave the heap a shove in excess of the lip in the entrance. Another moment there came up from underneath a howl of rage. encroachment, intrusion, invasion - any entry into an area not previously occupied; "an invasion of travelers"; "an invasion of locusts" https://entrancemats34455.blazingblog.com/37812776/entrance-mats-things-to-know-before-you-buy