How to Say "blue-collar worker" in Spanish
The Spanish word for “blue-collar worker” is “obrero” — A2 level. This is a very common word in everyday Spanish.

Examples
El obrero lleva un casco de seguridad.
The worker is wearing a safety helmet.
Los obreros de la fábrica piden mejores salarios.
The factory workers are asking for better wages.
Se necesita un obrero especializado para este trabajo.
A skilled laborer is needed for this job.
Specific Kind of Work
In Spanish, while 'trabajador' can be anyone with a job (like a lawyer or a teacher), 'obrero' is specifically for people who work with their hands, like in factories or construction sites.
Making it Feminine
Even though this entry is for the masculine 'obrero,' you simply change the 'o' to an 'a' (obrera) when talking about a female worker.
Don't use for office staff
Mistake: “Calling an accountant an 'obrero'.”
Correction: Use 'empleado' or 'trabajador'. 'Obrero' implies manual labor.
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