ADJ. long, short | narrow, wide | dark | subterranean, underground | connecting, entrance, escape, service | rail, railway, road | wind a wind tunnel for aerodynamic experiments
VERB + TUNNEL go through, use | disappear into, enter, go into The train disappeared into a tunnel. | come out of | bore, build, construct, dig, excavate They've built a new tunnel through the mountain. The initial section of tunnel had to be dug by hand.
TUNNEL + VERB run A service tunnel runs between the two buildings.
TUNNEL + NOUN mouth, roof, wall
PREP. through a/the ~
PHRASES a labyrinth/maze/network/system of tunnels The badger sett had twelve entrances to what must have been a labyrinth of tunnels.