Overcertification. When a bank certifies a check (see Certified check) and the drawer (issuer)
has not at the time enough funds on hand to meet it that is overcertification. The bank expects the
drawer to make up the deficiency by a deposit before the check is presented for payment.  
Overcertification is common and frequently is necessary in Wall Street. If stock for a large amount
is purchased the buyer may not have on deposit sufficient funds with which to pay for it. The
purchaser issues his check, which is certified by the bank on which it is drawn. Then he obtains a
loan from the bank, which is secured by pledging the stock purchased. The amount of the loan is
placed to the credit of the owner of the stock and thus his overdrawn account is made good.