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English definition of “seeing is believing”

seeing is believing

saying
said to mean that if you see something yourself, you will believe it to exist or be true, despite the fact that it is extremely unusual or unexpected: I never thought Simon would get out of bed before lunchtime on a Saturday, but seeing is believing!Using the eyesEyesight, glasses and lensesThe eye and surrounding areaPerceptiveBelieving
(Definition of seeing is believing from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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