The use of âholidayâ to mean âa missed spotâ appears to be that rarity in English etymology, a word or phrase that actually has a nautical origin. The original use of âholidayâ in the âmissed a spotâ sense, back in the 18th century, was in reference to crew members painting the decks of a ship or âpayingâ (sealing seams with tar or pitch) its hull.
The knee jerk reflex is when a tendon above the kneecap is tapped with a reflex hammer, which causes the whole leg to involuntarily jerk.
Patellar reflex. the extension of the knee that occurs when the quadriceps femoris tendon is stretched; a stretched tendon will stretch teh muscle and cause it to contract; this reflex helps prevent injury by preventing muscles from overstretching; the stretch reflex helps maintain posture and equilibrium.