to turn upside down.

to reverse in position, order, direction, or relationship.

to turn or change to the opposite or contrary, as in nature, bearing, or effect

to invert a process.

to turn inward or back upon itself.

to turn inside out.

Chemistry . to subject to inversion.

Music . to subject to musical inversion.

Phonetics . to articulate as a retroflex vowel.

Chemistry . to become inverted.

Chemistry . subjected to inversion.

a person or thing that is inverted.

a homosexual.

(in plumbing) that portion of the interior of a drain or sewer pipe where the liquid is deepest.

an inverted arch or vault.

Philately . a two-colored postage stamp with all or part of the central design printed upside down in relation to the inscription.

verb

alter , backtrack , capsize , change , convert , double back , evert , flip , flip-flop * , introvert , inverse , modify , overturn , renege , revert , tip , transplace , transpose , turn , turn down , turn inside out , turn over , turn the tables , upend , upset , upturn , reverse , upside-down