From Longman Dictionary of Contemporary Englishfour-starˈfour-star1 adjective [only before noun] a four-star hotel, restaurant etc is of a very high standard
Examples from the Corpus
four-star• When the four-star chef came to visit, he brought lunch.• It is splitting the flagship, four-star Forum Hotel from the chain and offering the two for sale separately.• Oeno would have a four-star hotel with 30 beds.• It is now a four-star hotel with a dozen youngsters in the galley and experienced actors on the bridge.• A four-star hotel with its own championship golf course set in a hidden world of parkland, forest and lakes.• The four-star officer believed his renewed efforts on character development were working well, according to Navy sources.• Kimmel held four-star rank and Short wore three stars on the day of the attack.four-starˈfour-star2 noun [uncountable] British English TTCa type of petrol with lead in itExamples from the Corpus
four-star• The top price for leaded four-star will be 179.6p.• In 1983 a gallon of four-star cost around £1.80. 