flashcards
"Flashcards" is a straightforward word with one main meaning, though it can be used both literally and figuratively. It refers to a classic and very popular learning tool that students all over the world use.
A flashcard is a small card with a question, word, or picture on one side, and the answer or explanation on the other side. You look at one side, try to remember the answer, then flip it over to check. Think of them as little memory testers you hold in your hand. 'Flashcards' is simply the plural — a set of these cards.
education, studying · Modern, widely used
In informal use, people sometimes use 'flashcard' as a verb, meaning to study or drill something using flashcards. It is not the most common usage, but you may hear it, especially among students.
informal, education · Informal, increasingly common among students
I've been flashcarding these vocabulary words all week.
She flashcarded the entire chapter the night before the test.