jiggle
n.a small, quick movement that goes up and down or side to side. You might use this to describe how a phone moves when it rings or how a person moves their foot while waiting.
n.a small, quick, and often irregular movement, typically involving a slight bounce or sway. Informal in register; frequently used to describe mechanical vibrations or nervous body language.
“The phone started to jiggle on the table when it rang.”
“The nervous student could not keep his foot still, giving it a constant jiggle while waiting for the exam to start.”
“The old engine produced a rhythmic jiggle that was felt through the entire cabin, a sound that had become a familiar comfort to the long-time crew.”
From jig + -le (frequentative suffix).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.