'Sinker' definitions:

Definition of 'sinker'

(from WordNet)
noun
A small ring-shaped friedcake [syn: doughnut, donut, sinker]
noun
A weight that sinks (as to hold nets or fishing lines under water)
noun
A pitch that curves downward rapidly as it approaches the plate

Definition of 'Sinker'

From: GCIDE
  • Sinker \Sink"er\, n. One who, or that which, sinks. Specifically: (a) A weight on something, as on a fish line, to sink it. (b) In knitting machines, one of the thin plates, blades, or other devices, that depress the loops upon or between the needles. [1913 Webster]
  • Dividing sinker, in knitting machines, a sinker between two jack sinkers and acting alternately with them.
  • Jack sinker. See under Jack, n.
  • Sinker bar. (a) In knitting machines, a bar to which one set of the sinkers is attached. (b) In deep well boring, a heavy bar forming a connection between the lifting rope and the boring tools, above the jars. [1913 Webster]