fall back means retreat (e.g. The general ordered the soldiers to fall back to a safer location.)
fall back on means be able to use an alternative (e.g. It is essential to have some money in the bank to fall back on if I can’t get a job soon.)
fall back means retreat (e.g. The general ordered the soldiers to fall back to a safer location.)
fall back on means be able to use an alternative (e.g. It is essential to have some money in the bank to fall back on if I can’t get a job soon.)