This is the 1733rd most frequent Catalan word.
mossos
"Mossos" refers to members of the Catalan police force, officially known as "Mossos d'Esquadra."
In this sentence, "mossos" is used as a shorthand reference to "Mossos d'Esquadra," the Catalan police force, indicating professionals fulfilling their duties.
Els mossos van arribar al lloc dels fets ràpidament.
The police officers arrived at the scene promptly.
Here, "mossos" again refers to policemen from the Catalan police force who are on patrol, contextualizing their professional role.
Ahir vam veure uns mossos d'esquadra patrullant pel barri.
Yesterday we saw some police officers patrolling the neighborhood.
In this context, "mossos" refers to the role of police officers but as a costume or imitation during an event, showing its depiction outside of actual professional duties.