Purple Patch

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PURPLE PATCH
A period of time when someone or something is successful and doing well.
A period of excellent performance.

Origin :
"Purple patches ", the literary equivalent of adding a patch of purple material to an otherwise undecorated garment. Purple was chosen because, as well as being a distinctive color, it was the color reserved for emperors and other distinguished statesmen in imperial Rome.

Usage : 
- The 22-year-old is enjoying a purple patch after winning back-to-back titles last month and is keen on grabbing a podium finish here. [Times Of India on Saina Nehwal]