The phrase "abnormal appearance" refers to something that looks unusual, uncommon or out of place. It could be a physical characteristic, behavior or situation that deviates from what is considered normal or expected. This term can be used in various contexts such as describing an individual's physical features, actions or circumstances that are not within the range of accepted standards or norms. For example, if someone has a visible deformity or injury that causes them to look different than others, their appearance would be described as abnormal. Similarly, behavior like excessive fear or aggression could also be referred to as having an abnormal appearance. In summary, the phrase "abnormal appearance" refers to anything that stands out as being unusual or uncommon in comparison to what is considered normal or average.