underpinning

underpinning

1. present participle of underpin

underpinning (plural underpinnings)

1. A support or foundation, especially as a structure of masonry that supports a wall.

   This house's underpinning is not up to standard.

2. (figuratively) A basis for something.

   I would like to know more about the underpinning of this political theory.

3. (figuratively, humorous) The lower body or legs.
   • 1913, Joseph C. Lincoln, chapter 1, in Mr. Pratt's Patients:

     Thinks I to myself, “Sol, you're run off your course again. This is a rich man's summer ‘cottage’ and if you don't look out there's likely to be some nice, lively dog taking an interest in your underpinning.”