Definitions
1.nounAn underground or underwater passage.
2.nounA passage through or under some obstacle.
3.nounA hole in the ground made by an animal, a burrow.
4.nounA wrapper for a protocol that cannot otherwise be used because it is unsupported, blocked, or insecure.
5.nounA vessel with a broad mouth at one end, a pipe or tube at the other, for conveying liquor, fluids, etc., into casks, bottles, or other vessels; a funnel.
6.nounThe opening of a chimney for the passage of smoke; a flue.
7.nounA level passage driven across the measures, or at right angles to veins which it is desired to reach; distinguished from the drift, or gangway, which is led along the vein when reached by the tunnel.
8.verbTo make a tunnel through or under something; to burrow.
9.verbTo dig a tunnel.
10.verbTo transmit something through a tunnel (wrapper for insecure or unsupported protocol).
11.verbTo insert a catheter into a vein to allow long-term use.
12.verbTo undergo the quantum-mechanical phenomenon where a particle penetrates through a barrier that it classically cannot surmount.