Showstopper
Definition 1 of 2

Performance
In a theatrical context, a showstopper captures the audience's attention.

The finale was a showstopper.
Business Appeal
In business, a showstopper can attract clients and investors.

Our new product feature is a showstopper that could lead to increased sales.
Critical Issues
A showstopper can also refer to a critical flaw needing immediate attention.

The bug in the software was a showstopper for the release.
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