Flat"ten (flăt"t'n), v. t.
[imp. & p. p. Flattened (?); p. pr.
& vb. n. Flattening.] [From Flat,
a.] 1. To reduce to an even
surface or one approaching evenness; to make flat; to level; to make
plane.
2. To throw down; to bring to the ground; to
prostrate; hence, to depress; to deject; to dispirit.
3. To make vapid or insipid; to render
stale.
4. (Mus.) To lower the pitch of; to
cause to sound less sharp; to let fall from the pitch.
To flatten a sail (Naut.), to set it
more nearly fore-and-aft of the vessel. -- Flattening
oven, in glass making, a heated chamber in which split
glass cylinders are flattened for window glass.
Flat"ten, v. i. To become or grow
flat, even, depressed, dull, vapid, spiritless, or depressed below
pitch.