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