Webster 1913 Edition
One who, or that which, sinks.Specifically:
A weight on something, as on a fish line, to sink it.
In knitting machines, one of the thin plates, blades, or other devices, that depress the loops upon or between the needles.
in knitting machines, a sinker between two jack sinkers and acting alternately with them.–
In knitting machines, a bar to which one set of the sinkers is attached.
In deep well boring, a heavy bar forming a connection between the lifting rope and the boring tools, above the jars.