What is nook and cranny?

"Nook and cranny" is an idiomatic phrase that refers to small, hidden or obscure corners or spaces in a room or place. The term is often used to describe hard-to-reach areas that are difficult to clean or access. The expression has been in use since at least the 1600s and is believed to have originated in England. A nook is a small corner or recess in a room, while a cranny is a narrow opening or crevice in a surface. Together, they refer to the small and often overlooked spaces that exist in a room or space. The phrase often emphasizes the importance of thoroughness and attention to detail, as these hidden areas can often harbor dust, dirt, and other debris if left unchecked.