Pronunciation: (sing'kur),[key] —n. 1. a person or thing that sinks.
2. a person employed in sinking, as one who sinks shafts.
3. a weight, as of lead, for sinking a fishing line or net below the surface of the water.
4. Slang.a doughnut or, sometimes, a biscuit or muffin.
5. Baseball.a pitched ball that curves downward sharply as it reaches the plate.