01 v. t. To reduce to an even surface or one approaching evenness; to make flat; to level; to make plane.
imp. & p. p.
Flattened; p. pr. & vb. n.
Flattening
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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.
To lower the pitch of; to cause to sound less sharp; to let fall from the pitch.(Mus.)
Phrases & compounds
To flatten a sail —
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.