This is the 12426th most frequent Spanish word.
mantuvieron
"Maintained" or "kept" (third-person plural past tense of "mantener").
In this sentence, 'mantuvieron' pertains to maintaining a state of being, specifically keeping calm.
Ellos mantuvieron la calma durante la tormenta.
They kept calm during the storm.
Here, 'mantuvieron' is used to denote maintaining the condition of an object, keeping it clean.
Mantuvieron la casa limpia durante toda la semana.
They kept the house clean throughout the week.
In this case, 'mantuvieron' expresses the continuation of a planned action or strategy.