noun

tunnelling

tunneling

The tunnelling project will take several years.

The tunneling project will take several years.

Tunnelling under the river is a complex engineering task.

Tunneling under the river is a complex engineering task.

((tunneling)) the activity of making a tunnel Tunneling under the river is a complex task.

Synonyms: excavation, digging, boring

From the word 'tunnel' plus the '-ing' suffix, which denotes an activity or process. Note the US spelling 'tunneling'.

Picture the action of creating a 'tunnel'. The '-ing' ending makes it the name of that action.

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