[only before noun] appearing on a computer screen quickly to display a list of choices, an advertisement, etc. while you are working on another document弹出式的◆Select the appropriate item from the pop-up menu.从弹出式菜单中选择合适的项。◆an effective way of blocking pop-up ads阻止弹出式广告的有效方法  ➡  drop-down , pop-under