Definition
Used to tell someone to calm down and not get so angry or upset.
别生气（bié shēng qì）
Keep your hair on! It's just a small misunderstanding.
冷静点！这只是个小误会。
Keep your hair on! We have plenty of time to solve this problem.
冷静点！我们有足够的时间解决这个问题。
Keep your hair on, please! Things aren't as bad as you think.
请冷静点！事情没有你想的那么糟。