Flat"ten , v. i. To become or grow flat, even, depressed, dull, vapid, spiritless, or depressed below pitch.
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.
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