Relax (informal)

• Cool it
• "Dude, relax!"
• Take it easy
• Prelude to a fever abroad? Don't worry
• Relax, to a refrigerator technician?
• Refrigeration mechanic's "Stay cool!"?
• Kid almost a yob? Relax
• Laid up in house with minor wound for dressing, relax

Wiktionary Word definitions in Wiktionary
n. (context colloquial English) A period of quiet, rest and relaxation, especially after a party etc.