Leverage ratio is the ratio of borrowing money. The leverage ratio is 100%, that is, there is no borrowing and no leverage. The leverage ratio is 140%, which means that the borrowed money accounts for 40% of the principal, and the leverage ratio is 200%, which means that the borrowed money is as much as the principal. And so on.
Leverage, in the financial field, usually means borrowing money to invest. If you use "lever" reasonably in your life, you can pry the heavy things you can't lift with very light force. This coincides with the fact that in the investment field, by means of "borrowing money", you can get higher returns with a small amount of principal. Therefore, it is more appropriate to use "leverage" as a metaphor for borrowing money to invest.