Definition of "underlayer" [un•der•lay•er]

• A layer that is below another layer. (noun)
• A perpendicular shaft sunk to cut the lode at any required depth. (noun)

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• "The laminate that was in here was floated, though the underlayer was a cheap sheet of foam that looked like packing material."
• "And of course, there's that whole "underlayer" possibility when worn with wrap dresses over them."
• "She favored full skirts and shorts, although there was a series of scuba-inspired, slim-fit dresses, or for a twist, there was a scuba top paired with a very feminine, more forgiving lilac-net skirt that had an orange underlayer peeking through."