Money at call and at short notice
An item on a balance sheet of a bank. Money at Call is money that must be repaid on demand. Money at short notice may be money borrowed for, say, twenty-four hours, at a very low interest rate. There is a great deal of money at short notice circulating in the City. When more money is offered than required, money is said to be ‘easy’ – when the reverse is true, money is said to be ‘tight’ in Lombard Street.
Reference: The Penguin Business Dictionary, 3rd edt.