a movable or sliding support for the dead center of a lathe or grinder.

1860–65; tail1 + stock

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World English Dictionary
tailstock (ˈteɪlˌstɒk)
a casting that slides on the bed of a lathe in alignment with the headstock and is locked in position to support the free end of a workpiece

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The work piece can slip into the chuck jaws and move away from the tailstock center, leaving it unsupported at the tailstock end.
The transducer is a source of heat, so the soak plate should be placed away from the tailstock.
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