DEFEAT (_third-person singular simple present_ DEFEATS, _present participle_ DEFEATING, _simple past and past participle_ DEFEATED)
* (transitive) To overcome in battle or contest.
_Wellington DEFEATED Napoleon at Waterloo._
* (transitive) To reduce, to nothing, the strength of.
He finds himself naturally to dread a superior Being that can DEFEAT all his designs, and disappoint all his hopes.
* A. W. Ward
In one instance he DEFEATED his own purpose.
* To nullify
The escheators […] DEFEATED the right heir of his succession.