overreact
1. [ verb ] show an exaggerated response to something
Examples:

"Don't overreact to the bad news--take it easy"

Related terms: react overreaction
Similar spelling:   overreaction
  overreach
  overact
  over-correct
  overreaching
  overexert
  overacting
  Overstreet
  overactive
  oversea
  ovariectomy
  overstretch
  overexcited
  overactivity
  overexertion
  overeager
  overgreedy
  overspread
  overstress
  overextend
  overgrowth
  oversee
  overcareful
  overage
  oversew
  overuse
  overachieve
  overweight