Comprehensive resource for understanding and mastering English idioms
The idiom "keep your pants on" is used to tell someone to be patient or wait until the right time to act. It can also mean to stay calm or composed during a stressful situation. The metaphorical meaning suggests that one's emotions are being restrained, similar to how one would keep their pants from falling down.
The origin of this idiom is not clear, but it has been in use since at least the 16th century. One theory suggests that it comes from the practice of wearing suspenders or braces to hold up one's pants during heavy labor or physical activity. If a person started to bend over or lift something heavy, their pants might fall down if they didn't keep them pulled up. Therefore, the phrase "keep your pants on" came to mean staying in control and not getting too excited or out of hand.