1) The northern form of ridge, used of the back of a person or animal.
1471 j togam ... penulatam cum gray rygges, Beverley
1582 wambes and rigges that is backs, York
1736 thou knows I laid a beesome start upon thy rig last night, Baildon. Sometimes found in compound adjectives: 1554 one whyte Rygged quye, Swillington
1588 a white rigged whye, Scalby. As a verb it could be to put something on the back in order to carry it: 1739 took 5 shalloons of the tenters and rigged them and carried them into his masters shop, Haworth. Additionally it meant ‘put a roof on a building’, with special reference to the ridge itself: 1399-1400 pro ryggyng pro prćdicta domo 4d, Ripon
1561 I riggyd the hall with atchlar, Woodsome
1682 shall slate all the aforesaide roofe ... and ... rigg the said building with good stone riggs, Scriven.