Knee jerk reaction

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Related to Knee jerk reaction: Knee jerk reflex immediate unthinking emotional reaction produced by an event or statement to which the reacting person is highly sensitive; - in persons with strong feelings on a topic, it may be very predictable.
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He is skilful, a crowd pleaser and I'm sure the knee jerk reaction of Spurs fans would be to want him to stay.
The latest knee jerk reaction by the LAUSD unearths new depths of hypocrisy.
The knee jerk reaction to finding any Web site is the dot-com.