[{"Bold_text": "noun", "List Items": ["an underground passage.", "a passageway, as for trains or automobiles, through or under an obstruction, as a city, mountain, river, harbor, or the like.", "an approximately horizontal gallery or corridor in a mine.", "the burrow of an .", "Dialect.a funnel."]}, {"Bold_text": "verb (used with object)", "List Items": ["to construct a passageway through or under:to tunnel a mountain.", "to make or excavate (a tunnel or underground passage):to tunnel a passage under a river.", "to move or proceed by or as if by boring a tunnel:The river tunneled its way through the mountain.", "to pierce or hollow out, as with tunnels."]}, {"Bold_text": "verb (used without object)", "List Items": ["to make a tunnel or tunnels:to tunnel through the Alps."]}]