反应过度（名词）

（noun）an excessive reaction; a reaction with inappropriate emotional behavior

EXAMPLE: The yen shot up against the dollar in Tokyo trading in what traders said was partly an overreaction to a headline by a news agency.

在东京市场，日元兑美元汇率一度大幅升高，交易员认为，这部分是由于市场对某家媒体的一条新闻标题反应过度。