Main entry: reversal, turn around
Definition: turning in an opposite direction or position
Usage: the reversal of the image in the lens
Main entry: pick up, turn around
Definition: improve significantly; go from bad to good
Usage: Her performance in school picked up
Main entry: turn around
Definition: improve dramatically
Usage: The new strategy turned around sales; The tutor turned around my son's performance in math
Main entry: swing about, swing around, turn around
Definition: turn abruptly and face the other way, either physically or metaphorically
Usage: He turned around to face his opponent; My conscience told me to turn around before I made a mistake