n.1. The fact or action of moving away or back, especially:
a. The erosion of a cliff or headland from a given point, as from the action of a waterfall.
b. The reduction of a glacier from a point of advancement.
c. The motion of celestial objects away from one another in an expanding universe.
2. A significant period of economic decline from the peak to the trough of a business cycle, characterized by decreasing aggregate output and often by rising unemployment.
3. The withdrawal in a line or file of participants in a ceremony, especially clerics and choir members after a church service.