English version

a moving target

From Longman Dictionary of Contemporary Englisha moving targeta moving targetsomething that is changing continuously, so that it is very difficult to criticize it or compete against it 🔊 The company is constantly improving the system, making it a moving target. moving
Examples from the Corpus
a moving targetAs always, this is a moving target.At its best, Gramm-Rudman-Hollings is a game of how to master a moving target.Nobody hits a moving target and you can quote me.Duration is a moving target as rates and portfolios change, though it is already used by many managers.Only the top half of her body was visible, and she resembled a moving target on a shooting gallery.
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