"battement fondu développé [bat-MAHN fawn-DEW dayv-law-PAY]: Battement fondu developed. This is performed in the same manner as battemen fondu simple(q.v). As the supporting leg straightens, the working leg does développé at either 45 or 90 degrees. If the développé is at 45 degrees, the working leg opens from sur le cou-de-pied. If the développé is at 90 degrees, the working leg is brought from sur le cou-de-pied to retiré, that opens in the desired direction as the supporing knee straightens. the leg moves evenly until reaching the angle of 45 or 90 degree and is sustained momentarily in the extended position before slowly returning to sur cou-de-pied as the suppoting leg executes a demi-plié."
Ballet Dictionary - ABT: https://www.abt.org/explore/learn/ballet-dictionary/