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1. Material or masonry used to support a structure, such as a wall.
2. often underpinnings A support or foundation: "It was the towns, not the cities, that provided the underpinnings for the great American experiment" (Frank Conroy).
3. underpinnings Informal The human legs.
(Building) a structure of masonry, concrete, etc, placed beneath a wall to provide support
un•der•pin•ning(ˈʌn dərˌpɪn ɪŋ)
1. a system of supports beneath a wall or the like.
2. Often, underpinnings. a foundation or basis: to strengthen the underpinnings of a friendship.
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1. A means or device that keeps something erect, stable, or secure:
2. The lowest or supporting part or structure.Often used in plural: