game, set, match

Meanings

1. Victory at the conclusion of a tennis match.
2. An expression indicating finality, announcing that a series of events—usually involving some form of rivalry—has reached a conclusion.

Etymology

Each noun names a component of the next one, and the final point scored by the victor is one that not only wins the game but also (thereby) wins the set and also (thereby) wins the match. The concept is comparable to the notion that the winning point not only makes their day but also makes their week and makes their month.