Longman Dictionary of Contemporary English homepage

knee-jerk

adjective
     
knee-jerk [only before noun]
a knee-jerk reaction, answer etc is what you feel or say about a situation from habit, without thinking about it [= automatic]:
A victim's knee-jerk reaction to the crime is often revenge.

Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.

Explore our topic dictionary