Webster's Revised Unabridged Dictionary · 1913

Vanquish

Vanquish (van"kwish) , transitive verb

[Old English venquishen, venquissen, venkisen, French vaincre, pret. vainquis, Old French veintre, pret. venqui, venquis (compare an Old French infin. vainquir), from Latin vincere; akin to Anglo-Saxon wīg war, battle, wīgend a warrior, wīgan to contend, fight, Old High German wīgant a warrior, wīgan to fight, Icelandic vīg battle, Gothic weihan to fight, contend. Compare Convince, Evict, Invincible, Victor.]

1.
To conquer, overcome, or subdue in battle, as an enemy. — Hakluyt
They... vanquished the rebels in all encounters. — Clarendon
2.
Hence, to defeat in any contest; to get the better of; to put down; to refute.
This bold assertion has been fully vanquished in a late reply to the Bishop of Meaux's treatise. — Atterbury
For e'en though vanquished, he could argue still. — Goldsmith

Vanquish , noun

(Farriery) A disease in sheep, in which they pine away.