References in common literature ? I gave the heap a shove over the lip from the entrance. The subsequent second there arrived up from underneath a howl of rage. encroachment, intrusion, invasion - any entry into a place not Beforehand occupied; "an invasion of travellers"; "an invasion of locusts" spot, https://entrance-mats01122.pointblog.net/the-2-minute-rule-for-entrance-mats-84993604