Potential energy (n.) is the unspent fuel of becoming: the mold decides only how fast and in which direction it gets spent.
Potential energy (n.) belongs to a system, not to an individual taken alone: it is energy of relation, and it is what gives relation a reality.
Potential energy (n.) is real without being a thing: it can't be weighed or pictured as a shape, yet it is no trick of the mind, because it can actually be spent.
Potential energy (n.) is made by a difference, not owned by a body: heat spread evenly through a block holds none to give, while the same heat split between a hot end and a cold end holds plenty.
Potential energy (n.) was what the ancients lacked a word for: knowing only stable and unstable balance, they could not think a metastable system loaded with it, like a supersaturated solution waiting for one seed crystal.