The Collaborative International Dictionary
Decrew
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.
Wiktionary
decrew
vb. (context obsolete rare English) To decrease, wane.