Mourn (verb)

1. To feel or express grief for someone or something.
2. To show respect for someone or something by wearing black or other sombre clothes, or by other actions.

Origin:

From the old english word "murnan", meaning to feel or express grief.

Examples:

1. She mourned the loss of her husband for many years.
2. The country mourned the loss of its leader.
3. We mourned the loss of our beloved pet.
4. The community mourned the loss of the historic building.
5. The family mourned the loss of the young soldier.