The word "scarper" is a slang term, meaning to run away quickly. Its antonym would be a word that means the opposite of fleeing or escaping, such as "confront" or "face". Other antonyms could include "approach", "arrive", or "stay". These words imply a sense of confrontation or engagement, rather than avoidance. Alternatively, words that convey the opposite sense of urgency could also serve as antonyms, such as "linger", "dawdle", or "saunter". Ultimately, the most appropriate antonym for "scarper" depends on the context in which it's used and the desired meaning.