Definition of overreact in US English:

overreact

verb

[no object]
  • Respond more emotionally or forcibly than is justified.

    ‘they are urging people not to overreact to the problem’
    • ‘Or perhaps it was merely his imagination overreacting: he was feeling thoroughly exhausted.’
    • ‘His weakness is that he sometimes overreacts to public criticism.’
    • ‘He overreacts, jumps up, screams and heads for the door.’
    • ‘Like so many emotions, anger is important to respond to but not overreact to!’
    • ‘The political culture may be overreacting, but it's overreacting to something.’
    • ‘You are so sensitive about the age difference that you overreact to every action on his part as an actual or potential sign of rejection.’
    • ‘A parent might even reply that the child is being silly, stupid, or overreacting for what they are thinking and feeling.’
    • ‘But that fact didn't prevent people from overreacting to the hype - even within our own company.’
    • ‘Confused and angry, the government overreacted in its response.’
    • ‘Before deciding how to meet this threat, check the soundness of your grapevine to make sure you're not overreacting to rumors.’
    • ‘That said anyone who has been investing for a little while knows that the market often overreacts to bad news and this can provide good opportunities.’
    • ‘If you haven't noticed, Heather overreacts, a lot.’
    • ‘We had a huge argument over something, and I overreacted, causing him to overreact.’
    • ‘Don't overreact to every bad grade or negative encounter your child has.’
    • ‘But I am not exaggerating things, and I am not overreacting to her.’
    • ‘Others find this more difficult - they may become withdrawn emotionally, or completely overreact to events.’
    • ‘While there is no way to fully avoid overreacting, understanding the emotional factor will help keep fear in check.’
    • ‘The inferences made by the psychologists in your report suggest she is insecure or unsure of herself which is why she overreacts so much.’
    • ‘The court noted that one defense psychiatrist had testified that the plaintiff was overly sensitive and may have overreacted to events on the job.’
    • ‘The emotions are so overwhelming that you tend to overreact.’
    get upset over nothing, react disproportionately, get overexcited, go too far, act irrationally, lose one's sense of proportion, exaggerate, make something out of nothing, make a mountain out of a molehill, blow something up out of all proportion
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Pronunciation

overreact

/ˌoʊvə(r)riˈækt//ˌōvə(r)rēˈakt/