The phrase "string side" refers to the area of a musical instrument known as the strings. It can mean either strumming or plucking the strings, or it can describe the side of the instrument where the strings are located. Full definition
A lower rise and string sides offer a flattering fit and modern look for everyday wear. (amazon.com)
If we have my forecasted new arrivals and we keep our full squad fit, we must surely have the best second string side in the competition. (justarsenal.com)
Defence Arsenal played a second string side in Thursday's clash with Ostersunds FK in the Europa League and duly conceded twice in the first half. (arsenalfcblog.com)