Meaning of Underpinning
un·der·pin·ning \'ən-dər-"pi-niŋ\ n (15c)
1 : the material and construction (as a foundation) used for support of a structure
2 : something that serves as a foundation : basis support — often used in pl. ‹the philosophical ~s of educational methods›
3 : underwear — usu. used in pl.
4 : a person's legs — usu. used in pl.
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