0 past simple and past participle of overreact --
1 to react in an extreme, especially an angry or frightened, way: --
Try not to overreact to criticism.
He later apologized, claiming he lost his temper and had overreacted without having all the facts.
A government investigative commission found that the security forces had overreacted.
Game claimed that officers overreacted and that he did nothing wrong when he was pepper sprayed by the mall security.
Believe me, patience is the best way to deal with such matters, but it was not the first time he overreacted and that is unacceptable.
It first played the issue down and kept it under wraps and then - at least in some cases - overreacted, even taking measures appropriate to a police state.
That hyped up the police, made them extremely edgy, and they overreacted.
However, because the tabloid press hyped the whole business to such an extent —to use jargon appropriate to the problem —the older generation has overreacted.
I think that on reflection both of them perhaps overreacted to the situation.