So as to invert the relative position of things or surfaces; so as to have a particular surface facing upwards.

Face downwards, prone.

Upside down. (Used as n. in quot. 1399.)

So as to make what was an upper surface a lower one, by turning it forward (or laterally) and downwards, or to turn something upside down. Also…

With the top where the bottom should be; in or into an inverted position; upside down, bottom upwards; also less definitely, In or into the…

Backwards, back to front, the wrong way round.

So that the upper part or surface becomes the under or lower. Frequently in to turn upside down; also in pred. use = inverted, overturned.

Upside down. Obsolete. rare.

In an inverted position, upside down.

So that the lower side or surface becomes the upper; upside down. Frequently collocated with turn.

top‥bottom. top to bottom (also bottom to top), so that the highest part becomes the lowest; with complete inversion.

So as to be upside down. Cf. inverse, adj. 1.

In an inverted manner; with a reversal of order, direction, or effect; in or from a reversed or upside down position. Cf. inversely, adv.

In or into a position with the belly or underside facing upwards; spec. (esp. of a fish) in or into this position as the result of dying.

= topsy-turvy, adv.

in a topsy-turvy manner.