What does it mean to 'substantiate' a statement?

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GCSE English Practice Test: Bias - Knowing The Difference Between Fact And Opinion — practice the complete quiz, review flashcards, or try a random question.

At the simplest level, 'bias' expresses the difference between fact and opinion. But texts are not always so simple - writers can make a highly-opinionated piece appear factual, or can choose to present facts and statistics in a selective, biased manner. Learning to spot bias will make you a careful, critical reader.


What does it mean to 'substantiate' a statement?