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controvert (verb) argue against; refute.
You controvert a person or their argument, when you argue against them or their argument. You oppose the other person's argument, if you controvert it. 'The paper controverted the government's claim of improvement of public health.' This means that the newspaper disagreed with the government's claim. To refute is also to controvert. When you prove that the other person's statement is wrong, you controvert it. If the other person complains that you evaded work, and you disprove it, you controvert his complaint.
- Argumentative by nature, Nelson always controverted whatever the others would say. He would oppose the others' statement, just for the pleasure of controverting it.
- The economists controverted the government's claim that inflation has come down. Their facts and figures have shown that the government was wrong.