the beginning of the end
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beginning of the end
1. The start of a decline. We didn't realize it at the time, but not having any interest in Valentine's Day was the beginning of the end for us—we broke up a month later. We all rushed to grandpa's bedside after his nurse warned us that it was the beginning of the end.
2. The first in a series of closing events. Senior prom is really the beginning of the end—graduation isn't that far away anymore.
the beginning of the endthe event or development to which the conclusion or failure of something can be traced.
1992 H. Norman Schwartzkopf It Doesn't Take a Hero I heard about D-Day on the radio. The announcer quoted Ohio governor John Bricker's now-famous line that this was ‘the beginning of the end of the forces of evil’.