from The Century Dictionary.
- noun In early English law, the forfeiture by tenant or vassal of his holding and his position as a freeman, resulting in a condition of servitude.
Sorry, no etymologies found.
He called upon all his people who by the duty of their tenure or allegiance were obliged to defend their lord and king, and in his writs stimulated them by the same threats of _culvertage_ which had been employed against him.
_culvertage_,  (a name of all things dreaded by both nations,) to attend in this expedition; and such force had this threat, and the hope of plunder in England, that a very great army was in a short time assembled.