head for the last roundup
old-fashioned To die. Primarily heard in US. When my grandmother was in her '80s, she always joked about heading to the last roundup. I think in some ways the fact that she treated it so light-heartedly made it easier to bear when she did finally pass away.
head for the last roundup
Euph. to reach the end of usefulness or of life. (Originally said of a dying cowboy.) This ballpoint pen is headed for the last roundup. I have to get another one. I am so weak. I think I'm headed for the last roundup.