Wiktionary
disappearing act
n. A sudden disappearance; the act of leave unexpectedly.
Usage examples of "disappearing act".
The appearing and disappearing act was over before I had time to pay more attention to it, and then the red scarf was in one hand while the boy's tiny hand was in my large one.
All the others might be subject to that strange disappearing act, but not the poor relation.
Ben sat, dazed, looking at the matted place in the bushes where Henry had done his disappearing act.
For one thing, Tom had absolutely no idea how Kressn had managed to pull that little disappearing act of his, and Sela hadn’.