Pas de valse is a classical ballet term meaning “waltz step.” It is usually done individually by female dancers, but is sometimes done with a partner.
A dancer doing a pas de valse will extend and step one leg as the other brushes front while decorating the step with classical looking port de bras. A dancer may also do a pas de valse en tournant which would be turning half way around each waltz step.
Pas de valse is usually taught in an intermediate ballet class because it requires a dancer to have a degree of balance, coordination and comfort with plié and degages in center.