Chapter Underactor to Underlay of U by Webster's Dictionary (1913 Edition)

1. To lay beneath; to put under.

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

3. To put a tap on [Prov. Eng.]

Underlay
(Un`der*lay"), v. i. (Mining) To incline from the vertical; to hade; — said of a vein, fault, or lode.

Underlay
(Un"der*lay`) n.

1. (Mining) The inclination of a vein, fault, or lode from the vertical; a hade; — called also underlie.

2. (Print.) A thickness of paper, pasteboard, or the like, placed under a cut, or stereotype plate, or under type, in the from, 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.