Web Browsing Features

noun a type of online advertisement that opens in a new browser window underneath the current window

adjective describing the type of online advertisement that opens in a new browser window underneath the current window

• The website displayed a pop-under ad when the user clicked on a link.
• I hate it when those annoying pop-under ads keep popping up.
• I can't stand those pop-under ads that sneak up on you.
• The unexpected pop-under of emotions caught her off guard.