The highest or uppermost side or portion of something. / A favourable aspect of something that also has an unfavourable aspect. / (finance) An upward tendency, especially in a financial market etc.

(informal) On the top of.

plural of upside

even with; revenged upon

Inverted, so that the top is now at the bottom. / In great disorder.

Inverted; turned so that the top is at the bottom. / In great disorder. / (finance) Owing more money for something than it is worth; having negative equity.

A fruit-based cake that is inverted after cooking.

plural of upside-down cake

(transitive, intransitive) To flip over; to rotate top to bottom. / (transitive, idiomatic) To thoroughly examine.

A fridge-freezer with the freezer in the lower half.