A patch attach is a sewing technique used to repair or reinforce fabric. It involves sewing a patch of material onto an existing piece of fabric. The crossword solutions for this term are 'SEW' (3 letters), 'MEND' (4 letters), and 'KNEE' (4 letters). Sewing is the process of stitching two pieces of fabric together, while mending is the act of repairing a damaged piece of fabric. KNEE is a reference to the KNEE-patch, which is a type of patch that is sewn onto the KNEE area of a garment to provide extra protection and reinforcement.