This is the 5552nd most frequent Spanish word.
plomo
Lead (the metal).
Here, 'plomo' refers to the chemical element lead, denoting a contextual usage in science and material discussions.
El plomo se utiliza en la fabricación de baterías.
Lead is used in the production of batteries.
In this case, 'plomo' emphasizes the presence of the element as a warning regarding safety concerns.
Cuidado, esa estructura tiene plomo y podría ser peligrosa.
Be careful, that structure contains lead and could be hazardous.
This usage of 'plomo' is metaphorical, meaning someone who could be perceived as boring or overly serious, demonstrating its colloquial application.