Subjacent Support
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
An easement of support of the soil as against an adjoining tract of land, so that the dominant tract shall not fall in by reason of undermining or withdrawal of support from beneath.
Tiedeman, Real Prop. § 618; 66 Pa. St. 429.