"Chaise lounge" might seem like some baroque word that English speakers borrowed from a longstanding French furniture name. That's only partially correct, because the actual French name for the chair is "chaise longue," which means "long chair." The word was misused, misspelled and mispronounced starting from around the beginning of the 20th century, and the "incorrect" version has prevailed in English ever since, to the extent that it's been added to dictionaries alongside the original spelling.