pop–up

1 pop–up /ˈpɑːpˌʌp/ adjective
1 pop–up
/ˈpɑːpˌʌp/
adjective
Britannica Dictionary definition of POP–UP
always used before a noun
1 
: having a picture that stands up when a page is opened
2 
computers : appearing on the screen over another window or document
2 pop–up /ˈpɑːpˌʌp/ noun
plural pop–ups
2 pop–up
/ˈpɑːpˌʌp/
noun
plural pop–ups
Britannica Dictionary definition of POP–UP
[count]
1 
baseball : pop fly
— see also pop up at 1pop
2 
computers : a window that appears on the screen over other windows or documents and that often advertises something