i.e. Their fear returned upon them with more violence, having now more leisure to consider things, and their wise and experienced father suggesting new matters to them, which might more deeply affect them.
Related Commentaries of Genesis 42:35
Genesis 42:35
35 And it came to pass as they emptied their sacks, that, behold, every man's bundle of money was in his sack: and when both they and their father saw the bundles of money, they were afraid.