great·en /ˈgretṇ/
  (vt.)使變大,使偉大(vi.)變偉大
  Great·en, v. i. To become large; to dilate. [R.]
     My blue eyes greatening in the looking-glass.   --Mrs. Browning. 
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  Great·en v. t. To make great; to aggrandize; to cause to increase in size; to expand. [R.]
     A minister's [business] is to greaten and exalt [his king].   --Ken.