Get grist to the mill to have plenty in store.
--Tusser. Q.
2. Supply; provision. --Swift.
3. In rope making, a given size of rope, common grist being a
rope three inches in circumference, with twenty yarns in
each of the three strands. --Knight.
{All is grist that comes to his mill}, all that he has
anything to do with is a source of profit. [Colloq.]
{To bring grist to the maill}, to bring profitable business
into one's hands; to be a source of profit. [Colloq.]
--Ayliffe.