The term 'USE YARN' can be broken down into two crossword solutions: KNIT (4 letters) and USE (3 letters). Knitting is a craft that involves using two needles to interlock loops of yarn or thread in order to create fabric. Yarn is a type of thread used for knitting, crocheting, weaving, and other crafts. Therefore, the phrase 'USE YARN' suggests using yarn to create something through knitting or other crafts.