A jiggle is when something wobbles back and forth, like your knees do when you try to stand up after sitting for a long time.
When people talk about food or liquids, they often use "jiggle" to describe how they look. For example, if there's leftover jelly in a jar that's been refrigerated overnight, it might have jiggled into strange lumps and bumps. Some foods like jam, custard, or even overcooked eggs can appear to jiggle when you take them out of the fridge. People will often say things like "the pudding has started to jiggle" or "the jelly's gone all wobbly".
A weak, shaking movement.
Example: Give the key a jiggle and see if it opens.
To shake something gently; to rattle or wiggle.
Example: Jiggle the handle and see if the water stops.
