Hello, I have seen this in a sports context, that of bicycling magazine while analysing adjective compounds for my PhD. It reads:"To stop things getting too boil-in-the-bag, the rear of the Diablo is made of mesh fabric and there are darts of fluoro-green reflective fabric on the front and back to add a little low-light visibility". What does it actually mean? What is the metonymy underneath it? Many thanks in advance.