A skilled metalworker who creates recessed designs in steel or other hard materials to make dies for stamping and forming operations.
From die (a form for shaping) + sink (to make a depression or hollow) + -er (one who does). The term emerged during the industrial revolution when precision manufacturing became essential.
Master diesinkers were artist-engineers who had to understand geometry, metallurgy, and tool mechanics—some of their handiwork on currency and industrial components is still in use over 100 years later.
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