'Calming down' is the process of reducing stress, anger, or excitement to regain control. It means becoming quieter, slower, and more relaxed after a strong emotion. People often pause, breathe, or rest to calm down.
There's a very wild side to me, but it's calming down. Alyson Hannigan
The melody faded like a rainbow after a storm, or like winds calming down at last; and what was left was calm, and possibility, and relief. Gregory Maguire
As I get older, I'm slowing down and, yes, calming down in my desire to be taken seriously. That I can be entertaining and funny and high nervous energy can work against me as a serious composer, slowly but surely you'll see me be quieter just so that people will listen. Marvin Hamlisch
The E.U. is an organization that was created after the Second World War for calming down the nationalism of member states, and it did so very successfully. Norman Davies