Last nail in the coffin and Point of no return

Point of no return and last nail in the coffin are semantically related. In some cases you can use "Point of no return" instead a noun phrase "Last nail in the coffin".

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

Last nail in the coffin and point of no return are semantically related. You can use "Last nail in the coffin" instead a noun phrase "Point of no return".