on a roll
Prepositional phrase
  1. (informal) Having a streak of good luck or good progress or success.
    He was on a roll with the answers that day and didn't want to stop.
    • 1984 Jan. 2, Charles P. Alexander, "[http://content.time.com/time/magazine/article/0,9171,921452,00.html Cheers for a Banner Year]," Time (retrieved 26 Aug 2015):
      With unemployment falling, incomes rising, inflation at bay and shoppers crowding into stores, the economy is entering 1984 on a roll.

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