The term 'FIX BY STITCHING' can be summarized by the crossword solution 'DARN'. Darning is a method of repairing fabric or clothing by stitching over the damaged area with a needle and thread. It is often used to repair holes in socks, sweaters, and other knitwear. Darning is also used to reinforce thinning areas of fabric, such as elbows and knees in jeans. The technique has been used for centuries and is still popular today.