cork
v.— «Cyclists in the group were performing a technique called “corking,” which involves a few cyclists blocking traffic so other riders can safely pass.» —“Critical Mass incident sparks safety conversation” by Sasha London Capitol Hill Times (Seattle, Washington) Aug. 10, 2008. (source: Double-Tongued Dictionary)
Further reading
A traffic-light sundae is a dish of vanilla ice cream decorated with red, white, and green cherries, topped with nuts, crushed fruit, or whipped cream. This is part of a complete episode. Transcript of “Traffic-Light Sundae” Grant, have you ever had...