underpin

Underpin is defined as to support, particularly from below.

(verb)

An example of underpin is for beams to hold up a tree house.

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See underpin in Webster's New World College Dictionary

transitive verb underpinned, underpinning

  1. to support or strengthen from beneath, as with props
  2. to support or strengthen in any way; corroborate, substantiate, etc.

See underpin in American Heritage Dictionary 4

transitive verb un·der·pinned, un·der·pin·ning, un·der·pins
  1. To support from below, as with props, girders, or masonry.
  2. To give support or substance to: “the public awareness that must underpin a sustained and concerted development effort for Africa and its youth” (Barber B. Conable).

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