butterflies in my tummy: the feeling you get in your stomach when you are nervous - it feels a bit like you have live butterflies in there.

A: "How are you feeling?"
B: "I've got butterflies in my tummy."
A: "That's perfectly normal before an exam. Its just the adrenalin pumping. It will help you perform better when you get in there."
B: "I need the loo."
A: "There's one just down there. Don't take too long, they'll be letting you into the exam hall soon."

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