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Definition of flatten:

  1. To become or grow flat, even, depressed dull, vapid, spiritless, or depressed below pitch.
  2. To lower the pitch of; to cause to sound less sharp; to let fall from the pitch.
  3. To make vapid or insipid; to render stale.
  4. To reduce to an even surface or one approaching evenness; to make flat; to level; to make plane.
  5. To throw down; to bring to the ground; to prostrate; hence, to depress; to deject; to dispirit.


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