v. To lay beneath; to put under.v. To raise or support by something laid under. See Underlay, n., 2.v. To put a tap on (a shoe).verb-intransitive. To incline from the vertical; to hade; -- said of a vein, fault, or lode.n. The inclination of a vein, fault, or lode from the vertical; a hade; -- called also underlie.n. 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.