Cách sử dụng
"Jack up" is an expression that means to raise something, usually with a mechanical device called a jack. It can also mean to increase or raise the price of something. For example, if you want to change a tire on your car, you might need to jack up the car to lift it off the ground so you can remove the tire. In a financial context, a company might jack up the price of their product to make more money. The expression is casual and informal, and typically used in conversation or writing where a more formal term would not be necessary.