Cách sử dụng
The expression "keep your powder dry" means to be prepared for a situation that may require you to act quickly and decisively. It comes from the days when guns were used, and gunpowder needed to be kept dry in order for the gun to work properly. So, if you are told to "keep your powder dry," it means to stay ready and be prepared for whatever may happen. This expression can be used in many different situations, both serious and lighthearted, such as when you are about to take an important exam, go on a first date, or start a new job.