Cascading Menu (noun)
A cascading menu is a type of menu that shows additional options when you move your mouse over a specific item in the main menu. This means that when you hover your cursor over a menu item, a new set of choices will appear, like a waterfall cascading down.
Imagine you are on a website with a menu that says "Services". When you hover your mouse over "Services", a cascading menu appears showing options like "Web Design", "SEO", and "Marketing". You can then click on any of those options to learn more.
In more advanced web design, cascading menus can be styled to look more attractive or to include icons next to each option. They can also be programmed to disappear after a certain time if you move your mouse away.
While there aren't specific idioms or phrasal verbs that directly relate to "cascading menu," you might encounter phrases like: - "Drop down" (as in “drop down menu”) which means to reveal or show something that was hidden.
A cascading menu is a useful design feature in applications and websites that allows for easy navigation by showing additional options when you hover over a main menu item.