Cutting or shaping material with a die; the present participle of 'die' when used as a verb in manufacturing.
From the verb 'die' (to cut or shape with a die), plus the present participle suffix '-ing,' used in industrial and manufacturing contexts.
Most people spell this 'dying' when talking about death, but in metalworking and manufacturing, 'dieing' specifically means using a die tool to shape metal or other materials.
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