The crossword solution for the term 'Pile of Hay in a Barn' is MOW, which is an abbreviation for mowing. Mowing is the process of cutting grass or other plants that grow in fields and lawns. It is typically done with a machine called a lawnmower, but can also be done by hand with a scythe or other cutting tool. Mowing hay in a barn is a common practice in farming, as it helps to keep the hay dry and free from pests.