Usage Note
Activar is a regular -ar verb. It covers both physical activation (e.g. activar una alarma) and figurative uses (activar la economía). The reflexive activarse means 'to kick in' or 'to spring into action' — el sistema de seguridad se activó (the security system kicked in).
Examples
"El bombero activó la alarma de incendio."
Natural Translation
The firefighter activated the fire alarm.
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