to start to work or play more effectively or quickly than before.
With just five lengths to go, the German swimmer stepped up a gear and edged ahead to win the race.
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step (it) up a gear
To begin to do something in a more energetic, vigorous, or effective manner than previously. They're going to have to step it up a gear if they want to beat the returning champions.I notice that you've really stepped up a gear with your work lately. Great job!