Flat; foolish.
To make flat; reduce to an equal or even surface; level.
To lay flat; bring to the ground; prostrate.
To make vapid or insipid; render stale.
In music, same as flat, 4.
To deaden or deprive of luster, as a pigment; bring to a smooth surface or even tint, without relief or gradation.
In optics, to free from curvature or distortion, as the lines of an image projected by a lens.
To become flat; grow or become even on the surface.
To become stale, vapid, or tasteless.
In music, same as flat, 3.