rubbering in
n.— «Tires were taken to the speedway for the race that Grant said were identical to the setup that was tested, and Pemberton said Friday’s practice session went normally. But it became apparent Saturday that the abrasive track was not building up a layer of rubber, a process called “rubbering in.” It usually occurs during practice sessions and lower-tier races, and it improves grip, leading to longer tire wear, Grant said.» —“Nascar Considers Changes After Tires Deflate a Race” by Dave Caldwell New York Times July 30, 2008. (source: Double-Tongued Dictionary)
Further reading
Carol in Williamsburg, Virginia, wonders why if you bake something and don’t rely on pre-mixed ingredients, you’re said to bake it from scratch. This expression originally referred to a line scratched into the ground to mark the starting point of a...
What’s the most common street name in the United States? Hint: It’s not Main Street or Third Street. It’s also not First Street. You’ll find the answer, along with lots of other fascinating information, in The Address Book: What Street Addresses...