underlayer

noun, verb — 4 senses

noun

Etymology From under- + layer.

A layer that is below another layer.

Business, Mining A perpendicular shaft sunk to cut the lode at any required depth.

One who underlays.

verb

Etymology From under- + layer.

To form a layer beneath another

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.