IdiomFood & DrinkEnglish

think the moon is made of green cheese

Meaning: To be very gullible.

Example: “If you believe that ad, you think the moon is made of green cheese.”

Origin: "Green cheese" meant young, fresh cheese, whose round pale shape could resemble the moon. John Heywood's proverb collection (1546) mocks people who believe the moon is made of green cheese.

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