Latin, non potuit ire, and variants.
An Anglo-Saxon tenant who 'could not go' with his land, or could not go to whichever lord he chose, had no freedom to dispose of the land since it was not his; it either belonged to his lord or was a dependency of an estate owned by his lord. Land held by a tenant who could not grant, could not sell, or could not withdraw, had the same limitation.
For further information, see Domesday Book: Sussex, edited by John Morris (Phillimore, 1976), note to entry 10,51; Domesday Book: Dorset, edited by Frank and Caroline Thorn (Phillimore, 1983), note to entry 26,1; Domesday Book: Devon, edited by Frank and Caroline Thorn (Phillimore, 1985), note to entry 1,15.
See also as a manor, and codes for tenures.