Definition of slip up

The origins of the phrase "slip up" can be traced back to the mid-19th century, specifically the mid-1850s. At that time, the phrase "slip" was commonly used to refer to a minor mistake or accident, such as a garment slipping off the shoulder or a cup slipping from the hand. The word "up" in this context adds an additional layer of meaning, indicating a failure or error that results in a negative outcome or consequence, as opposed to a simple slip or mishap. Together, "slip up" came to be used to describe a small mistake that leads to a larger setback or problem. One possible origin story for the phrase is connected to the football game of handball. In this sport, if a player drops the ball, it is considered a "slip," and if the other team scores as a result, the slip turns into a "slip-up." This meaning evolved beyond the sports context and became more broadly used to describe any minor misstep that results in a larger issue or setback. In summary, "slip up" is a relatively young expression, originating in the mid-19th century, that combines the meaning of a simple slip or accident with the added negative connotation of a mistake that causes a negative outcome or consequence.