To start to become better; to improve.
take a turn for the worse
To start to become worse; to worsen.
turn one's color
To change color, especially to become pale or red in the face.
they don't make them like that anymore
Expressing such notions as that the person referred to is excellent an…
turn turtle
To become upset.
go south
To become unfavorable; to decrease; to take a turn for the worse.
star turn
An acting performance which causes the performer to become renowned.