1. [n]  turning in an opposite direction or position; "the reversal of the image in the lens"
2. [v]  get better; "Her performance in school picked up"
3. [v]  cause to get better; "The new stategy turned around sales"; "The tutor turned around my son's performance in math"
4. [v]  turn abruptly and face the other way; also metaphorically; "He turned around to face his opponent"; "My conscience told me to turn around before I made a mistake"

Turnaround
An account of the successful anti-crime campaign waged in New York during the early days of the Giuliani administration by William Bratton, his Police Commissioner. Bratton introduced new techniques of police work that resulted in a phenomenal decrease in the city`s crime rate, but personal strains between him and the mayor led to his resignation in April 1996. A New York Times Notable Book for 1998.

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