was closing, used to close
Estaba tan gordo que el cuello no le cerraba.
He was so fat that his collar wouldn't close.
Escuché que la puerta se cerraba.
I heard the door closing.
— Una gran mujer (Beanpole) (2019)
Vaya, no sabía que la tienda cerraba tan pronto los domingos por la mañana.
Wow, I didn't know the store closed so early on Sunday mornings.