workharden

work-harden

[wurk-hahrd-n]
verb (used with object)
to toughen or strengthen (a metal) by cold-working or another mechanical process.
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World English Dictionary
work-harden
 
vb
(tr) to increase the strength or hardness of (a metal) by a mechanical process, such as tension, compression, or torsion
 
'work-hardening
 
n

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