Verb underpin has 2 senses
  1. underpin - support from beneath
    --1 is one way to
    hold, support, sustain, hold up
    Sample sentence:
    Something ----s something
  2. corroborate, underpin, bear out, support - support with evidence or authority or make more certain or confirm; "The stories and claims were born out by the evidence"
    --2 is one way to match, fit, correspond, check, jibe, gibe, tally, agree
    Sample sentences:
    Somebody ----s something
    Something ----s something
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