once in a blue moon

More idioms

• a piece of cakeSomething very easy to do
• break the iceTo make people feel comfortable in a new social situation
• don't judge a book by its coverDo not judge by appearance alone
• down to earthPractical, sensible and unpretentious
• hit the booksTo study hard
• in the same boatIn the same difficult situation as others
• keep an eye onTo watch carefully
• long story shortUsed to skip details and give the conclusion

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