verb (tunnels, tunneling, tunneled ; Britishtunnels, tunnelling, tunnelled)
- see light1.
late Middle English (in the senses 'tunnel net' and 'flue of a chimney'): from Old French tonel, diminutive of tonne 'cask'. sense 1 of the verb of the noun dates from the mid 18th century
Spell tunnel with a double n and a single l.
Do not double the final consonant when adding endings that begin with a vowel to a word that ends in a vowel plus a consonant, if the stress is not at the end of the word (as in target): (tunnels, tunneling, tunneled).