Related Clues:

• Teeter
• Become unsteady
• Have a bad day at the bank?
• Fall off a beam, e.g.
• Have a high-wire disaster
• Tip over, say
• One doesn't want to do this at a bank
• Falter and go into the red
• Go into debt, presumably, so be about to collapse?
• Stagger, seeing bank account emptied?
• Fall, as a tightrope walker