Point of no return and Watershed

Point of no return noun - A line that when crossed permits of no return and typically results in irrevocable commitment.

Watershed and point of no return are semantically related. In some cases you can use "Watershed" instead a noun phrase "Point of no return".

Watershed noun - A point in a chain of events at which an important change (as in one's fortunes) occurs.

Point of no return and watershed are semantically related. Sometimes you can use "Point of no return" instead a noun "Watershed".