1.
If you calm down , or if someone calms you down , you become less angry, upset, or excited.
Calm down for a minute and listen to me...
Do not have a drink or take drugs to calm yourself down.
PHRASAL VERB : V P , V n P , also V P n (not pron)
2.
If things calm down , or someone or something calms things down , the amount of activity, trouble, or panic is reduced.
We will go back to normal when things calm down...
Neil Howorth, director of the academy, tried to calm things down.
= settle down
PHRASAL VERB : V P , V n P