expansion joint

noun
a joint between two parts of a structure, machine, etc., permitting expansion, as from heat, without structural damage.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
expansion joint
 
n
engineering a gap in steel or concrete to allow for thermal expansion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The bridge rail sections at the bridge deck expansion joint were adjusted.
In end spans, the closure joint is usually nearer to the end expansion joint.
The anchors are cast into the joint panels on either side of the expansion joint.
Any grout that flows into an expansion joint shall be flushed from the expansion joint immediately.
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