defeat

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Concise Oxford English Dictionary © 2008 Oxford University Press:
defeat/dɪˈfiːt/
verb
  • 1 win a victory over.
  • 2 prevent the achievement of (an aim): this defeats the object of the exercise.

    ■ be too difficult for.

    Law make null and void.

noun an instance of defeating or being defeated.
– derivatives
defeated adjective,
defeatedly adverb.
– origin ME: from OFr. desfait ‘undone’, past part. of desfaire, from med. L. disfacere ‘undo’.
'defeat' also found in these Oxford entries:

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