Source : Webster's Revised Unabridged Dictionary (1913)

Decrew \De*crew"\, v. i. [F. d['e]crue, n., decrease, and
   d['e]cru, p. p. of d['e]cro[^i]tre. See {Decrease}, and cf.
   {Accrue}.]
   To decrease. [Obs.] --Spenser.