People say they have the collywobbles when they feel nervous in a shaky, uncomfortable way — often in the stomach — the feeling you get before a test, a talk, or a first date. It is a playful, informal word, heard more in British English than in American English, and it almost always takes the: the collywobbles. The slightly silly sound is the point. It lets you name a bad feeling without sounding medical or dramatic. Though actually, it can also mean a real upset stomach, not only nerves: someone might say the boat, or a heavy lunch, gave them the collywobbles. Americans more often say butterflies in my stomach, or just that they feel sick with worry. You would not put this in a formal essay, and you would not tell a doctor you have collywobbles. It is a home-and-friends word.

緊張到肚子不舒服、胃裡七上八下（英式口語；常說 the collywobbles）