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"Feeling Blue" idiom. I think that idiom means Arya is feeling sad. Another way to say it would be, "Arya wasn't smiling like usual because she was feeling sad."

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Before he had to give a presentation, Liam had butterflies in her stomach.

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Talia's mom was bent out of shape about being stuck in traffic.

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Arya wasn't smiling like usual and said she was "feeling blue."

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Marko asked his teacher to listen to something and his teacher said, "I'm all ears!"

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After making 2 appointments for the same time, Caleb said, "I'm In a pickle."

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Karem looked out the window and said, "it's raining cats and dogs!"

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Aoefa was having a hard day so her friend told her to keep your chin up.

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Kayla's mom told her to break a leg before her ballet performance.