serenar - to calm, to quiet, to sootheSpanish example: Sacó un cigarrillo de su bolso, lo encendió lentamente y aspiró el humo, mientras se serenaba.
English example: She took a cigarette from her purse, slowly lit it and inhaled the smoke while she calmed down.
Source: serenar - to calm, to quiet, to soothe (https://www.123teachme.com/spanish_feeds/word_of_the_day/2020/5/11)