Cách sử dụng
"At the double" is a phrase used to indicate that someone should hurry up or move quickly. It is often used in a military context to mean "quickly, but with urgency." For example, a sergeant might tell their soldiers to "fall in at the double" which means the soldiers should quickly form a line. In everyday English, you might say "we need to get to the store at the double" to mean that you need to get there quickly.