1 N-COUNT [usually singular, oft NOUN n] （汽车的）超速挡，超速变速器 The overdrive in a vehicle is a very high gear that is used when you are driving at high speeds. （汽车的）超速挡，超速变速器
2 PHRASE 加倍努力（或紧张） If you go into overdrive, you begin to work very hard or perform a particular activity in a very intense way. 加倍努力（或紧张）
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In the courtroom everybody went into overdrive, assuming that there might well be a verdict soon.
法庭里，人人都加倍紧张地行动起来，认为马上就要作出裁定了。
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