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The Collaborative International Dictionary of English v.0.48 (gcide)

Flatten \Flat"ten\, v. i.
To become or grow flat, even, depressed, dull, vapid,
spiritless, or depressed below pitch.
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Flatten \Flat"ten\ (fl[a^]t"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.
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2. To throw down; to bring to the ground; to prostrate;
hence, to depress; to deject; to dispirit.
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3. To make vapid or insipid; to render stale.
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4. (Mus.) To lower the pitch of; to cause to sound less
sharp; to let fall from the pitch.
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{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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