Learn in the textbookGUI Screen Controls, Menus, and Auxiliary Displays
DefinitionA pull-down menu (プルダウンメニュー) opens downward when you choose a heading, such as one on the menu bar, and has you pick one of the items it shows.
ExplanationNormally only the heading is shown, and the list is pulled down only when you need to choose, so it takes up little screen space. Choosing an item or clicking outside the list closes it. It is also called a drop-down menu.
AnalogyIt works like a roller blind on a window: you pull it down when needed and roll it back up when you are done.
Memory hookPull down means to draw something downward, and that direction, from the heading downward, is exactly what the name says.