on demand　

on demand　即期，见票即付　

1.borrowing：Loan that must be repaid in full on the day the lender“calls”it（see call）for whatever reason.Known also a demand loan.2.trading：Bill of exchange（such as a demand draft or an uncrossed check）that is payable on the day it is presented to the drawee（or his or her bank）and does not require acceptance.