"battement, grand [grahn bat-MAHN]: Large battement. An exercise in which the working leg is raised from the hip into the air and brought down again, the accent being on the downward movement, both knees straight. This must be done with apparent ease, the rest of the body remaining quiet. The function of grands battements is to loosen the hip joints and turn out the legs from the hips. Grands battements can be taken devant, derrière and à la seconde."
Ballet Dictionary - ABT: https://www.abt.org/explore/learn/ballet-dictionary/