The term 'make edging' refers to a type of sewing technique used to finish the edges of fabric. The two crossword solutions, TAT and HEM, are both methods of making edging. TAT stands for tatting, which is a form of lace-making that uses a shuttle or needle to create intricate patterns. HEM stands for hemming, which is a method of folding and stitching the edge of fabric to prevent fraying. Both techniques are commonly used in garment construction and other sewing projects.