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.

Flat, v. i. 1. To become flat, or flattened; to sink or fall to an even

surface. Sir W. Temple.