Alternative spelling of turnabout.

present participle of toss and turn

Approximately at the end of one year and the beginning of the next.

The beginning or end of a certain century.

(idiomatic) To make a change or reversal of a general trend.

(philosophy) In the history of Western philosophy, the shift in philosophical attention from the classical and medieval focus on themes of metaphysics to a primary focus on themes and issues relating to human knowledge, usually considered to have occurred during the period from Descartes (1596-1650) through Kant (1724-1804).

(philosophy) The shift which occurred in philosophical attention, during the 20th century and within a number of philosophical schools of thought, from traditional themes of metaphysics and epistemology to a focus on the structure and usage of language and the relation of language to human understanding of those traditional themes.

(military, aviation, archaic) A WWI-era fighter pilot maneuver resembling the aerobatic wingover or hammer-head turn, originally developed by Max Immelmann.

(idiomatic) To create a particular linguistic expression which is strikingly clear, appropriate, and memorable.

(idiomatic) To excite (often sexually), to increase interest.