below the fold

(newspapers) Printed on the lower half of the front page of a broadsheet newspaper, such that it is not immediately visible on a folded copy of the newspaper, e.g. as displayed at a newsstand or in a vending machine.

(by extension, web and application design) Far enough down that it is not likely to be visible in the initial display of a standard sized window or screen, such that the end-user will probably have to scroll down before seeing it.