Answer: lightenup

AnswerCrossword Clue
LIGHTENUP

"Relax, will ya!"

LIGHTENUP

Take it easier

LIGHTENUP

Dieter's credo?

LIGHTENUP
"Chill!"
LIGHTENUP
Relax
LIGHTENUP"Don't act so serious!"
LIGHTENUP"Don't be so serious!"
LIGHTENUP"Relax!"