Manifestaban (en. They were demonstrating)

ma-ni-fes-ta-ban

Slang Meanings

To make noise about a specific issue.
People started to manifest about the tax increase.
La gente comenzó a manifestar sobre el aumento de impuestos.
To express something emphatically or passionately.
She was expressing her love for music in a very vibrant way.
Ella manifestaba su amor por la música de una forma muy vibrante.