UNDERPIN

underpin. Underpin, v.t. to prop, support, lay the foundation wall

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Un′der‐pin″ (?), v. t. [imp. & p. p. Underpinned (?); p. pr. & vb. n. Underpinning.] 1. 1. To lay stones, masonry, etc., under, as the sills of a building, on which it is to rest.
2. 2. To support by some solid foundation; to place something underneath for support.