action group action group /ˈækʃən ɡrup/

noun

1. A group of people formed to accomplish some task or take part in some collective action  ( action group )
   a group of people formed to accomplish some task or take part in some collective action
   
2. [American] (US military) a component of a naval task force  ( action group [American] )
   (US military) a component of a naval task force