Back in the ward, he found his wife lying vanquished beneath the blankets like a desiccated old vegetable, wrinkled, dry and white, her enfeebled tissues absolutely still.
He cursed himself for his gullibility and wished in panic for something like a mask or a pair of dark glasses and a false mustache to disguise him, or for a forceful, deep voice like Colonel Cathcart’s and broad, muscular shoulders and biceps to enable him to step outside fearlessly and vanquish his malevolent persecutors with an overbearing authority and self-confidence that would make them all quail and slink away cravenly in repentance.
There are no more uses of "vanquish" in the book.
Show samples from other sources
The team vanquished all competition.
You need to vanquish those negative thoughts and think about good things.