Definition of tunneler in US English:

tunneler

noun

  • See tunnel

    • ‘Room after room of the city's buildings had holes hacked through the walls by tunnellers.’
    • ‘The work by specialist tunnellers, which will take nearly three months to complete, is part of a giant engineering jigsaw that Scottish Water says will bring Glasgow's water supply into the 21st century.’
    • ‘Underground worker Roger Barron, 53, revealed that some coalface workers and tunnellers were earning up to £1,000 a week before Wistow closed.’