1. to be almost used up or to approach having none of something
run short/low on food/money/patience
To 'run short on' something or to 'run low on something' means to have almost used up a supply of something or that there is only a small amount of something left. "We are running low on coffee, can you get some on the way home?" "I am running short on money this month, I have had a lot of expenses."