This is the 9993rd most frequent Spanish word.
calmar
To calm or soothe.
Used in the sense of making something less agitated or stressed.
Traté de calmar al gato acariciándolo suavemente.
I tried to calm the cat by petting it gently.
Used to refer to reducing inner anxiety or feelings.
Ella decidió calmar sus nervios tomando una taza de té.
She decided to calm her nerves by having a cup of tea.
Implying bringing relaxation through an external stimulus.