It means don't be expecting much. When people hold their breath, they are waiting for something to happen. WHen people give the advice of dont hold your breath, they are saying taht there isn't anything going to happen
Answer: The vocabulary is more difficult to understand.
Explanation: Because the literature of the old English is more complicated. It is almost never to the point. The metaphors are harder to understand because of the culture this changes when the times become closer to the English now.
