FLATTENv.t.
flat'n.
1. To make flat; to reduce to an equal or even surface; to level.
2. To beat down to the ground; to lay flat.
3. To make vapid or insipid; to render stale.
4. To depress; to deject, as the spirits; to dispirit.
5. In music, to reduce, as sound; to render less acute or sharp.
FLATTENv.i.
flat'n.
1. To grow or become even on the surface.
2. To become dead, stale, vapid or tasteless.
3. To become dull or spiritless.