hammer-in
n.— «Mr. Moran was stricken by cancer a number of years ago and it came back last August, Mr. Hendrickson said. “He was pretty brave about it,” and was able to travel in October to Arkansas for a knife “hammer-in” as the event is called.» —“Bill Moran dies at age 80″ by Nancy Luse Frederick News-Post (Md.) Feb. 13, 2006. (source: Double-Tongued Dictionary)
Further reading
Mary Beth in Greenville, South Carolina, wonders: Why do we say four-oh-nine for the number 409 instead of four-zero-nine or four-aught-nine? What are the rules for saying either zero or oh or aught or ought to indicate that arithmetical symbol...
Astronauts returning from space say they experience what’s called the overview effect, a new understanding of the fragility of our planet and our need to reflect on what humans all share as a species. A book about the end of the universe...