Relax, to a refrigerator technician?

• Refrigeration mechanic's "Stay cool!"?
• "Dude, relax!"
• "Don't get so worked up!"
• Prelude to a fever abroad? Don't worry
• Laid up in house with minor wound for dressing, relax
• Relax (informal)
• Cool it
• Take it easy

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