From Longman Dictionary of Contemporary Englishspring into actionspring into action (also spring to/into life)DO something/TAKE ACTION to suddenly become active, start moving, or start working They were prepared and ready to spring into action. Finally, the engine sprang to life. → spring
Examples from the Corpus
spring into action• Bellas and her crew sprang into action.• Faced with such an unprecedented threat, Church leaders sprang into action.• The six kids who have organized this trip spring into action.• When a black freshman is threatened with racist graffiti, she is the first to spring into action.• You know, lulling you to sleep before springing into action.• Ten-mile tailbacks blocked roads as bargain hunters sprang into action after three days at home.• The brave granny sprang into action when she heard Kathleen Wallace scream.• He sprang into action when wife Ann, 26, suddenly went into labour in the middle of the night. 