(transport, civil engineering) A culmination tunnel.

plural of summit tunnel

plural of culmination tunnel

(transport, civil engineering) A tunnel driven through a pass at fairly high altitude to minimize the length of tunnel required, at the cost of requiring steeper and more winding routes up to each end of the tunnel.

(US) The screaming crowds near Wellesley College during the annual Boston Marathon.

A kind of motor vehicle road rally for high-performance vehicles, emphasizing recreational driving in a group, especially through tunnels.

Alternative spelling of bridge-and-tunnel

(science fiction) a passageway enabling time travel

(rail transport) The man-made tunnel under the English Channel joining England and France.

(idiomatic) A round piece of jewelry with a hole in the middle, which fits into a stretched earlobe.