Many words in English are based on the same root words, and knowing what these mean can help us with spellings.
The root 'cred' is found in a lot of English words. It comes from a Latin word meaning 'belief' or 'trust'.
If you are incredulous about something it means you find it hard to believe.
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If you buy something on credit you don't have to pay for it at the time because the seller trusts that you will pay at a later date.
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