(of bodies) to move easily and quickly across a surface while twisting or curving. (Cambridge Dictionary)
Move smoothly over a surface with a twisting or oscillating motion. (Oxford Dictionaries)
Slide or slip unsteadily on a loose or slippery surface. (Oxford Dictionaries)
To slide on or as if on a loose gravelly surface. (Merriam – Webster)
To slip or slide like a snake. (Merriam – Webster)
If you slither somewhere, you slide along in an uneven way. (Collins Dictionary)
If an animal such as a snake slithers, it moves along in a curving way. (Collins Dictionary)
Sliver, slither, or have they converged?