from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To support from below, as with props, girders, or masonry.
  • transitive v. 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).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To support from below with props or masonry.
  • v. To give support to; to corroborate.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To lay stones, masonry, etc., under, as the sills of a building, on which it is to rest.
  • transitive v. To support by some solid foundation; to place something underneath for support.

from The Century Dictionary and Cyclopedia

  • To pin or support underneath; place something under for support or foundation when a previous support is removed; underset; hence, figuratively, to support; prop.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. support with evidence or authority or make more certain or confirm
  • v. support from beneath


from Wiktionary, Creative Commons Attribution/Share-Alike License

under- +‎ pin



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