a voluntad

at will

→ a
phrase Rare #51,054
at will Indicates that someone can act as they choose, without restriction; in commands, it can mean to do something whenever one chooses.
SP: Puedes cambiar de opinión a voluntad.
EN: You can change your mind at will.

¡Fuego a voluntad!

Fire at will!

— La Grande Vadrouille (1966)

Puedes ir y venir a voluntad.

You can come and go as you please.

Un viento juguetón se detiene a voluntad.

A playful wind stops at will.

— La Casa de los Cuchillos (2004)

Entre gente disfrazada, aparecía y desaparecía a voluntad.

Amidst the costumed crowd, he appeared and disappeared at will.

— Rang de Basanti (2006)