Break the ice - Start a conversation in a friendly way, Hit the books - Study hard, Piece of cake - Very easy, Let the cat out of the bag - Reveal a secret, Under the weather - Feeling sick, Spill the beans - Tell a secret, Cost an arm and a leg - Very expensive, Bite the bullet - Do something difficult or unpleasant, Once in a blue moon - Very rarely, Call it a day - Stop working for the day,

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