late 15c., earlier upsadoun (late 14c.), up so down (c. 1300); the so perhaps meaning "as if." As an adjective from 1866.

When you owe more on a loan than your vehicle is worth. This happens because vehicles depreciate rapidly during the first years after they leave the showroom, and is a dangerous situation for several [..]

You're considered upside down (or sometimes “underwater) if you owe more on your vehicle loan than your vehicle is worth.

An unwanted financial position that consumers find themselves in when the outstanding balance of a loan is higher than the current fair market value of the property.

This refers to Engels' saying that Marx "turned Hegel on his head". See Ludwig Feuerbach Part IV See the sampler for comparisons of Hegel and Marx.

A situation in which the car buyer owes more money on their trade-in than the dealership is willing to give for the trade-in. The difference is applied to the lease amount.

Owing more money on a loan than your vehicle is worth. See also Negative Equity.