Synonyms for d-day, original dday 6/6/1944
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
pivotal moment
start time
strait
target
target day
the time
turning point
vital moment