1) To curdle, of milk, especially for cheese-making.
1646 one of her kyne whose mylke earned in the gallin, Heptonstall
1651 at divers times this informant could not get butter when she chirned nor cheese when she earned, Wakefield. Examples of ‘earning’ include: 1612 1 earnynge pott, Brandsby
1662 Amongst other things there is ... one earning tubb, Selby
1741 put in your Erning when ready, Pontefract.