Bible Dictionaries
Underpin

Webster's Dictionary

(1):

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

(2):

(v. t.) To support by some solid foundation; to place something underneath for support.

Bibliography Information
Webster, Noah. Entry for 'Underpin'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​u/underpin.html. 1828.