The phrase "watch your six" means "watch your back" or "be aware of what is behind you." It originates from military aviation, where the position behind a person is referred to as the six o'clock position on a clock face, with 12 o'clock being directly in front. So, telling someone to "watch their six" is a warning to be vigilant about potential threats coming from behind
. This expression has expanded beyond military use and is now commonly used in everyday language to advise caution or alert someone to possible unseen dangers. It can be used literally, such as warning someone that an enemy or danger is behind them, or more generally as a reminder to stay alert and cautious
. In summary, "watch your six" is a cautionary phrase meaning to be mindful of your rear or to watch your back for potential threats or problems
