Project GLAD

One of the many possible meanings of the prefix "auf-" is "up": e.g. "aufwärts" = upwards; "Auftrieb" is the force that "lifts" an airplane up; "Aufschwung" is an upswing in the economy. "Stehen" = "to stand" ==> aufstehen = stand up, get up [Unexpectedly analogous: aufessen = to eat up, i.e. to finish one's food] ................
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