1) To make firm.
This word appears to have been recorded only in Yorkshire. In 1642, the East Riding farmer Henry Best wrote that when they were thatching a stack with stubble they mixed haver strawe with it to make it cragge well. In the context the meaning appears to be ‘to make firm’ or ‘make hold together’. When Clapham Bridge was being mended, in 1747, the item in the accounts For cragging the bottom fraims seems to have had a similar meaning.