This feels like a watershedmoment for British business.
Times, Sunday Times (2015)
Then one speaking opportunity turned out to be a watershedmoment.
Christianity Today (2000)
This could be a watershedmoment.
The Sun (2015)
Seekey moment
Definition of 'watershed'
watershed
(wɔːtəʳʃed)Explore 'watershed' in the dictionary
countable noun [usually singular]
If something such as an event is a watershed in the history or development of something, it is very important because it represents the beginning of a new stage in it.