Verb (used with object), : a flag ensanguined with the blood of battle.    From Dictionary.com. 

This would not cut his hat or ensanguine his band.    From Wordnik.com.  [Historical Mysteries] Reference

But in the attempt to incarnate and ensanguine it I failed wretchedly.    From Wordnik.com.  [Seven Men] Reference

His eyelids were inflamed, and but served to ensanguine the bitter and cold-blazing intensity of the pupils.    From Wordnik.com.  [The Mutiny of the Elsinore] Reference

But because the blind boy's shaft, designed to work inward ever deeper and deeper until it reached the heart's core, did now but ensanguine itself, he made no cry nor any sign of that sweet hurt.    From Wordnik.com.  [Sir Mortimer] Reference

Thy milder terrors, Night, I frequent woo, Thy silent lightnings, and thy meteor’s glare, Thy northern fires, bright with ensanguine hue, That light in heaven’s high vault the fervid air.    From Wordnik.com.  [The Romance of the Forest] Reference

"But at the same time, Sire, the chamber of representatives will not show itself less eager, to proclaim its sentiments and its principles with regard to the terrible conflict, that threatens to ensanguine the fields of Europe.    From Wordnik.com.  [Memoirs of the Private Life, Return, and Reign of Napoleon in 1815, Vol. II] Reference

His bristly neck ensanguine.    From Wordnik.com.  [The Metamorphoses of Publius Ovidus Naso in English blank verse Vols. I & II] Reference