RESCRIBING is taking a sharp tool almost like a dentist probing pick, and drawing it across the line. It takes out a small sliver of plastic making it recessed line. Some modelers even rescribe kits with recessed lines, why they do this I don't know.
But for my technique you don't have to do that. Just draw the over the raised or recessed line with a marker before painting. The reason I had to do that to the Airacomet is Hobbycraft's panel lines are too soft, and I don't like to rescribe. I usually make more of a mess.