underprop

From under- +‎ prop.

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underprop (third-person singular simple present underprops, present participle underpropping, simple past and past participle underpropped)

1. (transitive) To prop from beneath; to put a prop under; to support; to uphold, prop up.
   • 1603, Michel de Montaigne, translated by John Florio, The Essayes […], London: […] Val[entine] Simmes for Edward Blount […], →OCLC:
     , II.12:

     He hath employed all his wit to frame him selfe anew (as impatient of his fortune) and to underprop or uphold himselfe by his inventions.