The term 'A Case of Pins and Needles' can be summarized by two crossword solutions: ETUI (4 letters) and SEW (3 letters). An ETUI is a small ornamental case, usually made of metal or leather, used to store sewing items such as needles, pins, and thimbles. Sewing, or SEW, is the process of joining two pieces of fabric together using a needle and thread. Therefore, the term 'A Case of Pins and Needles' refers to a container for storing sewing supplies, such as needles and pins.