Overdrafts

noun

1. The act of overdrawing a bank account.
2. The amount overdrawn.

   "I have an overdraft of £1234."

3. The maximum amount that may be overdrawn.

   "The bank have given me an overdraft of $2000."

4. The extraction of groundwater from an aquifer beyond the safe yield or equilibrium yield.
5. A series of flues in a furnace; the current of air forced through them.