- 2short for wind tunnel.
verb (tunnels, tunnelling, tunnelled; US tunnels, tunneling, tunneled)
- see light1.
late Middle English (in the senses 'tunnel-shaped net' and 'flue of a chimney'): from Old French tonel, diminutive of tonne 'cask'. sense 1 of the noun dates from the mid 18th century
Spell tunnel with a double n and a single l.
Double the l when adding endings which begin with a vowel to words which end in a vowel plus l (as in travel): (tunnels, tunnelling, tunnelled).