From Longman Dictionary of Contemporary Englishin/like a flashin/like a flash (also quick as a flash)FAST/QUICK very quickly Just wait here. I’ll be back in a flash. → flash
Examples from the Corpus
in/like a flash• If he knew what I wanted he'd be out of the car and away in a flash of shock.• It's all done in a flash these days.• The computer can sort and edit a mailing list in a flash.• It was over in a flash.• The lesson seemed to pass in a flash.• Two shots, they stop in a flash.• Shelby chooses the green chair for her dad, then like a flash, she's off to the house.• We went by the tower like a flash and landed on the red cross near the newly set-up hospital tent.• He also had a nature that went violent in a flash. 