to move with small, twisting or wriggling motions like a worm or insect; to squirm

the slow, permanent deformation of a solid material under the influence of mechanical stresses

peristalsis (wave movement of gut wall)

moving in a slow, sinuous, or twisting motion like a worm

to wriggle forward

soft-bodied organisms with a worm-like shape, formerly used as a broad taxonomic category for invertebrates.

creep (friction mechanics)