Definition of contradict oneself
: to say or do something that is opposite or very different in meaning to something else that one said or did earlier
The witness contradicted herself when she insisted she could identify the thief even though she had said that the night was too foggy to see clearly.
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Which Word Does Not Belong?
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- Which of these words does not mean "nonsense"?

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Merriam-Webster unabridged
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