Un`der*pin" (?), v. t. [imp. & p. p. Underpinned (?); p. pr. & vb. n. Underpinning.]

1.

To lay stones, masonry, etc., under, as the sills of a building, on which it is to rest.

2.

To support by some solid foundation; to place something underneath for support.

 

© Webster 1913.

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