The crossword solution for the term 'make a muffler' is KNIT. To make a muffler, one must use knitting techniques to create a fabric tube that can be used to reduce the sound of an engine. Knitting is a process of interlocking loops of yarn or thread to create a fabric. The fabric created by knitting is often used to make clothing, blankets, and other items. In this case, it is used to make a muffler.