ground loop

noun Aeronautics.
a sharp horizontal loop performed, usually involuntarily, while touching the ground.
Origin:
1920–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
ground loop
 
—n
a sudden uncontrolled turn by an aircraft on the ground, while moving under its own power

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Ground loop is always a great word to know.
So is ort. Does it mean:
a chattering or flighty, light-headed person.
a scrap or morsel of food left at a meal.
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Example sentences
Each ground loop is also pressure-tested for leaks and integrity before it
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It is also used to operate a ground loop geothermal heating and
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Each heat pump package is plumbed in parallel with the ground loop.
Even leaving out the cost of ground loop installation, the equipment is still
  much more expensive for residential installations.
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