Calm verb - To free from distress or disturbance.
Usage example: the president's reassuring words did much to calm the public during the national emergency
Pacify is a synonym for calm in activity topic. In some cases you can use "Pacify" instead a verb "Calm", when it comes to topics like soothe, quiet, allay, assuage. popular alternative
Pacify verb - To lessen the anger or agitation of.
Usage example: the only thing that would pacify the child and end the tantrum was a new toy
Calm is a synonym for pacify in activity topic. You can use "Calm" instead a verb "Pacify", if it concerns topics such as comfort, allay, appease, assuage. popular alternative
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Google Ngram Viewer shows how "calm" and "pacify" have occurred on timeline