Keep the wolf from the door
Definition 1 of 1
Pro Tip 1/3Emotional Tone
Implies worry or hardship related to money matters, suggesting a difficult situation. 
During the recession, many families could just keep the wolf from the door.
Pro Tip 2/3Metaphorical Use
The 'wolf' is a metaphor for hunger or poverty, so the phrase is not about real wolves. 
We've cut down on all luxuries just to keep the wolf from the door.
Pro Tip 3/3Cultural Context
This phrase comes from times when wolves were a real threat, symbolizing imminent danger. 
He's been working two jobs to keep the wolf from the door.