A log or spar floating on end (vertically) and mostly submerged. Also called a sinker.
An old log which has lost most of its bouyancy, and now floats nearly vertical, with one end down, and the upper end just at or below water level. Deadheads are common in old harbors where logs were floated in for loading on boats.
a log, with who knows how many branches, that has soaked up enough water for one end to sink, leaving only a short fat stump showing above the surface