Noah Webster's Dictionary 1. (n.) A quagmire filled with decayed moss and other vegetable matter; wet spongy ground where a heavy body is apt to sink; a marsh; a morass. 2. (n.) A little elevated spot or clump of earth, roots, and grass, in a marsh or swamp. 3. (v. t.) To sink, as into a bog; to submerge in a bog; to cause to sink and stick, as in mud and mire.

Multi-Version Concordance Bog (1 Occurrence) Psalms 40:2 He brought me up also out of a horrible pit, out of the miry clay. He set my feet on a rock, and gave me a firm place to stand. (See RSV)