v. [UNDER-1 4 a.] trans. To provide with, or form, a floor or under-floor.
1778. Phil. Trans., LXVIII. 890. The method of underflooring I have also applied … to a wooden stair-case.
1884. Coues, Key N. Amer. Birds (ed. 2), 155. The basitemporal and parasphenoid bones which underfloor the whole skull.
