[countable] 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.这款新车于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飚升 40%。◆a debut bond issue首发债券