v. i. (Mining) To incline from the vertical; to hade; -- said of a vein, fault, or lode. [ 1913 Webster ]

n. 1. (Mining) The inclination of a vein, fault, or lode from the vertical; a hade; -- called also underlie. [ 1913 Webster ]

2. (Print.) A thickness of paper, pasteboard, or the like, placed under a cut, or stereotype plate, or under type, in the form, to bring it, or any part of it, to the proper height; also, something placed back of a part of the tympan, so as to secure the right impression. [ 1913 Webster ]

v. t. [ AS. underlecgan. See Under, and Lay, v. t. ] 1. To lay beneath; to put under. [ 1913 Webster ]

2. To raise or support by something laid under; as, to underlay a cut, plate, or the like, for printing. See Underlay, n., 2. [ 1913 Webster ]

3. To put a tap on (a shoe). [ Prov. Eng. ] [ 1913 Webster ]

n. 1. One who, or that which, underlays or is underlaid; a lower layer. [ 1913 Webster ]

2. (Mining) A perpendicular shaft sunk to cut the lode at any required depth. Weale. [ 1913 Webster ]