Hi That's interesting and others may disagree with me; the saying is very old. The wolf is an ancient symbol of humans in an animal state. It's a state that we like to think of ourselves as having left quite a few millennia ago If we have done enough to keep the wolf from the door, we have done enough and learnt enough to move away from that situation.
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contrapositionWhat is the origin of the idiom "keep the wolf from the door"?The origin may be lost in history, but "the wolf" was most likely a metaphoric reference to hunger.