pivotal moment

climax critical point crux culmination juncture twist

axis change climacteric contingency crisis critical mass critical moment critical period crossing crossroads crucial moment crucial occurrence crucial period crunch cusp decisive moment defining moment development emergency exigency high noon hinge kairotic moment moment of truth nexus pass peak peripeteia pinch pivot point of no return race against time rising action shift strait transition turn of the tide when push comes to shove zero hour

A-day D-day H-hour appointed hour climax contingency countdown crisis crisis point crossroad crossroads crunch time deadline emergency exigency jumping-off point juncture moment of truth pinch start time strait target target day the time turning point vital moment