Emily Dickinson Lexicon

FLAT'TEN, v.t. [flat'n; Fr. flatir, from flat.]

1. To make flat; to reduce to an equal or even surface; to level.
2. To beat down to the ground; to lay flat. Mortimer.
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.