a computer menu, window, etc. that can be brought to the screen quickly while you are working on another document; a computer window, especially one containing an advertisement, that appears on the screen although it has not been requested （计算机）弹出式选单，弹出式窗口，弹出式广告 an advertising pop-up 弹出式广告
a shop, restaurant, etc. that opens quickly somewhere and is designed to only use that location for a short period of time 短期经营的店铺；快闪店 The designers opened a pop-up in the main shopping area as part of the fashion event. 作为时尚活动的一部分，设计师在主购物区开了一家临时店。
- (also pop fly)
(in baseball 棒球 a ball that is hit high into the air but does not go far, making it easy to catch