Flat (?), v. t. [imp. & p. p.Flatted (?); p. pr. & vb. n.Flatting (?).] 1. To make flat; to flatten; to level.
2. To render dull, insipid, or spiritless; to depress.
Passions are allayed, appetites are flatted. Barrow.
3. To depress in tone, as a musical note; especially, to lower in pitch by half a tone.