overreact
verb (used without object)
to react or respond more strongly than is necessary or appropriate.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Melanie Bien, of mortgage broker Private Finance, said that the markets had been "overreacting" to potential rate rises and this had been reflected in the growing costs of fixed-rate mortgages.
From BBC ● Feb. 10, 2011