means The act of keeping money or resources aside rather than spending or using them now, so they're available later.

from From the verb "save," which arrived in English through Old French "sauver" from Late Latin "salvare," "to make safe," rooted in Latin "salvus," "unharmed, whole" — the same family that gives us "salvation" and "safe." So to save money is, quite literally, to keep it from harm; the "-ing" form simply turns the rescuing into an ongoing habit.