sinker

noun7

1. •
   That which sinks or descends.
2. •
   A weight used in fishing to cause the line or net to sink.

   • Hook the sinker onto this loop.
3. •
   Any of several high speed pitches that have a downward motion near the plate; a two-seam fastball, a split-finger fastball, or a forkball.

   • His sinkers drew one ground ball after another.
4. •
   (slang) A doughnut; a biscuit.

   • Of the fifty cents, ten went for the glassy shoeshine; twenty-five for a boutonniere; ten for coffee and sinkers at the Cockeyed Bakery. — 1926
5. •
   One who sinks something.

   • McLachlan's value as a coal miner was enhanced by the specialized skill he learned as a shaft-sinker. — 1999
6. •
   A sinker nail, used for framing in current construction.
7. •
   In knitting machines, one of the thin plates, blades, or other devices, that depress the loops upon or between the needles.