Do, perform, stage a disappearing/vanishing act Definition 1 of 2Pro Tip 1/3Unexpected Exit Used when someone leaves suddenly and it's surprising or inconvenient. Mike did a disappearing act from the party before cleaning up. Pro Tip 2/3No Forwarding Info Implies leaving without giving information on how to be reached or found. After winning the lottery, she staged a vanishing act and moved overseas. Pro Tip 3/3Avoiding Responsibility Often suggests avoiding a task or duty on purpose, sneakily. He performed a disappearing act when it was time to sign the documents.