Knee jerk reaction的意思

"Knee jerk reaction" is an English idiom that refers to a quick, automatic, and often unthinking response to something. The phrase originates from the medical term "patellar reflex," also known as the knee-jerk reflex, which is a reflexive movement of the lower leg in response to a sharp tap on the knee. In this reflex, the leg kicks out suddenly without any conscious effort.

In a metaphorical sense, a knee-jerk reaction is a response that is immediate and instinctive, but may not be well-thought-out or appropriate to the situation. It often implies that the reaction is not based on careful consideration or analysis, but rather on an instinctive or emotional response.

For example, if someone loses their job and immediately decides to move back in with their parents without considering other options, this could be described as a knee-jerk reaction. Similarly, if a politician makes a statement in response to a crisis without fully thinking through the implications, it might be criticized as a knee-jerk reaction.

The phrase is often used in a negative context, suggesting that a more thoughtful and considered response would be preferable. However, it can also be used to describe situations where a quick response is necessary or appropriate, such as in emergency situations where immediate action is required.