shoot-em-upnoun [ C ]
also shoot 'em up uk/ˈʃuːt.əmˌʌp//ˈʃuːt̬.əmˌʌp/informala film that involves a lot of fighting with guns :
"Revolver" is the latest Guy Ritchie shoot-em-up.
This is no conventional shoot-em-up western.
a type of video game in which the aim is for a single character to kill as many enemies as possible :
Sega's basic but hilarious shoot-em-up