flatten is a Verb
[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] 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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