'Flatten' definitions:

Definition of 'flatten'

(from WordNet)
verb
Make flat or flatter; "flatten a road"; "flatten your stomach with these exercises"
verb
Become flat or flatter; "The landscape flattened" [syn: flatten, flatten out]
verb
Lower the pitch of (musical notes) [syn: flatten, drop] [ant: sharpen]

Definition of 'Flatten'

From: GCIDE
  • Flatten \Flat"ten\, v. i. To become or grow flat, even, depressed, dull, vapid, spiritless, or depressed below pitch. [1913 Webster]

Definition of 'Flatten'

From: GCIDE
  • 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. [1913 Webster]
  • 2. To throw down; to bring to the ground; to prostrate; hence, to depress; to deject; to dispirit. [1913 Webster]
  • 3. To make vapid or insipid; to render stale. [1913 Webster]
  • 4. (Mus.) To lower the pitch of; to cause to sound less sharp; to let fall from the pitch. [1913 Webster]
  • 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. [1913 Webster]