Plain, v. t. [imp. & p. p. Plained p. pr. & vb. n. Plaining.]
1. To plane or level; to make plain or even on the surface. [R.]
We would rake Europe rather, plain the East. --Wither.
2. To make plain or manifest; to explain.
What's dumb in show, I'll plain in speech. --Shak.
Plain·ing, n. Complaint. [Poetic]
Plain·ing, a. Complaining. [Poetic]