Arrepentir should not be in the SD Dictionary
Administrator take note - arrepentir appears in the SD dictionary, but is not actually a word in Spanish. We can leave arrpentirse alone, however.
1 Answer
You are right that it's not an actual Spanish word or verb, but it's commonly used as in this sentence "no se va a arrepentir" or "no se arrepentirá" as in "you won't regret", usually as a catch frase when advertising something.
Obviously it goes accompanied by a pronoun; 'me', 'le' and so on, hence the confusion, I suppose.