1. responds to something with more emotion or force than is reasonable or necessary
Usage: third person singular present tense of ‘overreact’

Examples

• She always overreacts when her children are five minutes late.
• The market overreacts to minor economic news.
• He overreacts to criticism and takes everything personally.
• My mom overreacts whenever I mention getting a tattoo.
• The dog overreacts to the doorbell by barking for ten minutes.
• The teacher overreacts to small disruptions in class.