noun

tunneling

tunnelling, excavation

The tunneling project will take several years.

The tunnelling project will take several years.

Quantum tunneling is a fascinating phenomenon.

Quantum tunnelling is a fascinating phenomenon.

((tunneling)) the act of digging a tunnel The tunnelling through the mountain was difficult.

Synonyms: excavation, digging, boring

From the noun 'tunnel' plus the suffix '-ing' which denotes an action or process.

Picture a mole 'tunnelling' through the ground.

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