From The Collaborative International Dictionary of English v.0.44 [gcide]:
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
83 Moby Thesaurus words for "undergird": affirm, afford support, attest, authenticate, back, back up, bear, bear out, bear up, bed on, beef up, bolster, bolster up, bottom on, brace, brace up, build on, buoy up, buttress, carry, case harden, certify, circumstantiate, confirm, corroborate, cradle, crutch, cushion, document, finance, fortify, found on, fund, gird, give support, ground on, harden, hold, hold up, invigorate, keep, keep afloat, keep up, lend support, mainstay, maintain, nerve, pillow, probate, prop, prop up, prove, ratify, refresh, reinforce, reinvigorate, restrengthen, set on, shore, shore up, shoulder, stay, steel, stiffen, strengthen, subsidize, substantiate, subvention, subventionize, support, sustain, temper, toughen, underbrace, underlie, underpin, underset, upbear, uphold, upkeep, validate, verify, warrant
Define.com is a registered nonprofit corporation dedicated solely to the global public interest and the advancement of humanity. It belongs to all of us who have a desire to promote electronic democracy, science, creativity, imagination, reason, critical thinking, peace, race and gender equality, civil rights, equal access to education, personal liberty, free speech, animal rights, compassionate and nonviolent parenting, social and economic justice, global monetary reform, Secular Humanism, cognitive liberty and a permanent cessation of The War on Drugs.
Let's see what we can do if we put our heads together.0