To make a mistake or fail to handle a responsibility properly, especially when others are counting on you.
This American phrase comes from sports, particularly baseball and football, where literally dropping the ball results in missed opportunities or points for the opposing team. It gained broader usage in the mid-20th century as a metaphor for any kind of failure in responsibility.
The beauty of this sports metaphor is how it captures both the suddenness of failure and the public nature of disappointment. Unlike private mistakes, dropping the ball in sports happens in full view of teammates and spectators, just like professional failures often affect entire teams or organizations.
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