This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To defeat or conquer in battle; subjugate.

v. To defeat in a contest, conflict, or competition.

v. To overcome or subdue (an emotion, for example); suppress: "She had had to wrench herself forcibly away from Katharine, and every step vanquished her desire” ( Virginia Woolf). See Synonyms at defeat.

v. To defeat, to overcome.

v. To conquer, overcome, or subdue in battle, as an enemy.

v. Hence, to defeat in any contest; to get the better of; to put down; to refute.

n. A disease in sheep, in which they pine away.

To conquer; overcome; especially, to subdue in battle, as an enemy.

To defeat in any contest, as in argument; get the better of.

To confute; show to be erroneous or unfounded; overturn.

To overpower; prostrate; be too much for.

To overpower the peculiar virtue or properties of; destroy or render inert; neutralize.

= Syn. 1. Overcome, Subdue, etc. (see conquer), surmount, overthrow; rout, crush.

n. A disease of sheep in which they pine away. Also vinquish.

v. come out better in a competition, race, or conflict

"There's just too many references – like Tessa says, we're asking an audience in Los Angeles to know what "vanquish" and "lactating" mean, not to mention the Battle of Orleans, Joan of Arc, and the French."

vanquished    vanquishes    vanquishing   

defeat    overcome    get the better of   

vinquish   

get the best    immobilize    overcome    outflank    surmount    lick    outmatch    have the best    whip    spread-eagle   

overcome    conquer    silence    confute    surmount    refute