References in traditional literature ? I gave the heap a shove above the lip in the entrance. The next moment there arrived up from underneath a howl of rage. encroachment, intrusion, invasion - any entry into a location not previously occupied; "an invasion of travellers"; "an invasion of locusts" location, https://entrancemats79012.blogolize.com/the-fact-about-entrance-mats-that-no-one-is-suggesting-76669127