1. past tense and past participle of tunnel; dug or bored a tunnel through or under something
Usage: British spelling; American spelling is ‘tunneled’

Examples

• The miners tunnelled through the mountain for three years.
• Prisoners tunnelled under the prison wall to escape.
• The subway line was tunnelled beneath the city center.
• Workers tunnelled through solid rock to build the highway.
• The moles had tunnelled extensive networks under the garden.
• Engineers tunnelled a passage connecting the two buildings.