“keep the wolf from the door”不能解释为“把狼挡在门外”

【例句】He earned very little money and could hardly keep the wolf from the door.【误解】他挣的钱很少，几乎不能把狼挡在门外。

【正确】他挣的钱很少，几乎不能养家糊口。

【说明】keep the wolf from the door意思是“使不受饥寒”。