etiquetar
/etikeˈtaɾ/ · B2 · verb
to label
🏷️ etiqueta = label; etiquetar adds -ar to make it the action: to label
Etiqueta is the noun for a label or tag, and etiquetar is the verb built on it. The English cognate is etiquette, which began as a ticket or tag listing rules. On social media, etiquetar means to tag someone in a post.