sinker

noun

1. One who sinks something.
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. Sinker nail, used for framing in current construction.