n. One who or that which sinks or causes to sink. Particularlyn. In knitting-machines, stocking-frames, etc., one of several flat pieces of metal attached to the jacks, and also to the sinker-bar, and serving to form loops in the thread between the needles. See jack, 11 , sinker-bar, and knitting-machine.n. A cesspool.n. A hollow sinker containing shot, that may be adjusted to any required weight.n. A sinker with spiral rings, which can be put on and taken off the line without disturbing the hook or bait.n. Same as dead-head, 4.n. A heavy dumpling or doughnut; a dough-sinker; a dough-boy.n. A (silver) dollar.n. See the extract.