การเคลื่อนที่ถอยหลัง(gaan klêuuan-têe tŏi lăng)

reverse motion; backward movement

movement in the reverse or backward direction relative to the previous or normal direction (e.g., a vehicle backing up, a mechanism moving in reverse).

retrograde motion (astronomy/physics)

in astronomy, the apparent backward motion of a planet against the background stars; more generally in science, motion opposite the usual or expected direction within a system.