the.com/jiggle
The motion of something that refuses to commit to either staying still or moving.
means To shake or move with small, quick, rhythmic jerks — neither a wobble nor a full shake.
from An 18th-century blend of jog and wiggle, both ancient words for nudging things into motion — language doubling down on the fidget.
Lock trickJiggling keys frees stuck pin tumblers.
Physics termJiggling describes thermal molecular motion to physicists.
Reduplication kinSibling of wiggle, wriggle, and squiggle.