"Massive withdrawals" means taking out or removing a large amount of money or resources from a bank account, investment, or any other system. Full definition
The industry has underperformed the stock and bond markets as a whole, resulting in massive withdrawals by their investors. (washingtonpost.com)
Uncertainty during this stage drove Greek depositors to make massive withdrawals from their bank savings, bringing Greek banks to the brink of collapse and reportedly causing the ECB to consider the imposition of capital controls. (europeanlawblog.eu)
Add to that all the uncertainty — what impact are these massive withdrawals going to have, nobody knows? (financial-planning.com)