Common assurances
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
The several modes or instruments of conveyance established or authorized by the law of England. Calied "common" because thereby every man's estate is assured to him.
2 Bl. Comm. 294.
The legal evidences of the translation of property, whereby every person's estate is assured to him, and all controversies, doubts, and difficulties are either prevented or removed.
Wharton.