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Webster 1913 Edition

Verb.

[F.

décrue

, decrease, and

décru

, p. p. of

décroître

. See

, and cf.

To decrease.

[Obs.]

Spenser.

Verb.

To decrease.

decrew ‎(third-person singular simple present decrews, present participle decrewing, simple past and past participle decrewed)

(obsolete, rare) To decrease, wane.
- 1596, Edmund Spenser, The Faerie Queene, IV.6:
  But toward th'end Sir Arthegall renewed / His strength still more, but she still more decrewed.