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Adjective
- moving or directed or tending in a backward direction or contrary to a previous direction
- going from better to worse
- of amnesia; affecting time immediately preceding trauma
- moving from east to west on the celestial sphere; or--for planets--around the sun in a direction opposite to that of the Earth
Verb
- get worse or fall back to a previous condition
- move in a direction contrary to the usual one
- move backward in an orbit, of celestial bodies