[] the first time that sb/sth appears in public; the first time that sth is available to buy 首次亮相；首次面市◆The new car makes its debut in the UK this weekend. 这款新车於本周末在英国首次亮相。◆Shares in the company soared 40% on their stock market debut. 这家公司的股票一上市即飈升 40%。◆a debut bond issue 首发债券