Meaning
To relax after being angry or excited.
Example Sentence
"You need to calm down before driving."
Synonyms
relax
settle down
soothe
compose oneself
Usage Note
This phrasal verb is separable. When using a noun object, it can go between the verb and particle or after the particle. When using a pronoun object, it must go between the verb and particle (e.g., "turn it off" not "turn off it").