The phrase "between luck" appears to be a typographical error or misinterpretation of "between luck and hard work" or "between luck and skill." These phrasings refer to the balance or relationship between the role of chance (luck) and the effort or ability (skill) in achieving success. It suggests that while luck can play a part in success, hard work and skills are also crucial in determining the outcome.
The word "luck" comes from the Middle Dutch word "luc," meaning "happening" or "to take place," which transitioned into the English language. The origin relates to occurrences that are favorable or unfavorable without control by the individual.