Reverse Withdrawal
Reverse withdrawal is a feature that lets you cancel a withdrawal request while it's still in the pending period and return the funds to your playable balance. On the surface, it sounds like a convenience feature. In practice, it's one of the worst things in online gambling.
Here's what actually happens. You win $500. You request a withdrawal. The casino puts it in a 48-hour pending period. During those 48 hours, a button sits on your screen saying "Cancel Withdrawal." You keep looking at it. Your balance shows $500 sitting right there. Eventually, at 2 AM on a Tuesday, you click it. You play the $500. You lose it. The casino keeps the money.
Some of the best casinos in the industry have removed reverse withdrawal entirely. If a casino offers instant or near-instant processing with no reverse option, that tells you something about whether they're built to keep your money or pay it out. Look for casinos that process withdrawals without giving you the chance to second-guess yourself.