torsion bar

noun
a metal bar having elasticity when subjected to torsion: used as a spring in various machines and in automobile suspensions.

Origin:
1945–50

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World English Dictionary
torsion bar
 
n
a metal bar acting as a torsional spring, esp as used in the suspensions of some motor vehicles

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The door shall be torsion bar loaded for ease of lifting and shall have safety locking handle in open position.
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