An underground cell, chamber, or vault; esp. one used as a burial place and typically lying beneath a church. Also: such a space used as a chapel…

A burrowing; any small tubular excavation, or underground passage. Obsolete.

Military and Mining. An underground passage, horizontal or nearly so; a level or drift.

Archaeology. plural. Narrow rock-cut channels or tunnels, esp. in the burial vaults of ancient Egypt.

(a) a cave or tunnel; (b) Australian a natural depression in a rock that catches water; = gnamma hole, n.

a passage that goes through, or as if through, cellars; (also) the entryway of a cellar.

A subterranean passage; a road-way excavated under ground, esp. under a hill or mountain, or beneath the bed of a river: now most commonly on a…

Mining and Civil Engineering. A passage driven horizontally (cf. headway, n. 2); spec. one for draining overlying ground.

A passage beneath something; an underground passage, a subway. In later use also: a smaller or subsidiary branch of a passage or network of passages.

Chiefly British. An underground tunnel providing access to sewers and other subterranean public utilities, or used to convey water and gas pipes…

A tunnel (esp. a walkway) beneath a road, river, railway, etc., permitting easy movement from one side to the other.

A (section of) road providing passage beneath another road or a railway; a subway. Cf. overpass, n.