How to Say "mourning" in Spanish
The Spanish word for “mourning” is “duelo” — B1 level. This is a very common word in everyday Spanish.

Examples
Después de la muerte de su abuelo, ella pasó por un largo duelo.
After her grandfather's death, she went through a long period of mourning (grief).
El duelo es un proceso natural y necesario.
Grief is a natural and necessary process.
La familia guardó duelo durante un año.
The family observed a period of mourning for a year.
Gender Check
Remember that 'duelo' (grief) is masculine, so you always use 'el duelo' or 'un duelo'.
Duelo vs. Dolor
Mistake: “Using 'dolor' when talking about emotional loss ('Tengo dolor por mi perro').”
Correction: Use 'duelo' for deep emotional grief related to loss, and 'dolor' for physical pain or general sadness ('Tengo duelo por mi perro').
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