“I see,” she says. “So you’re a smarty-mouth. Then see if you
can understand this. Michael Andrew, you have detention.”

“What? But…”

“Not another word, young sir.”

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detention 在高中課本和新聞上常作「拘留」，或是當年台灣爆發 SARS 或像肺炎等傳染性疾病時時，也表示「隔離」。
根據 google 字典解釋，這個字在校園裡的用法是一種處罰的方式，即「課後留校」或「留校察看」。
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Detention is a punishment for naughty schoolchildren,
who are made to stay at school after the other children
have gone home.