knee jerk (medicine) and Kept Busy - Motor Sports (gambling)

knee jerk (medicine)

knee jerk

The reflex tested by tapping just below the bent knee on the patellar tendon to cause the quadriceps muscle to contract and bring the lower leg forward. It has given rise to the saying: a knee-jerk reaction. Also known medically as the patellar reflex.

Kept Busy - Motor Sports (gambling)

A driver is distracted (or kept busy) by another driver who is relentlessly pursuing.

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