Fifty cards, each with the idiom, a clear B2 definition, an example sentence, and two usage notes on the back — a register label (informal, neutral or spoken) plus a close paraphrase like “similar to: get things started.” Rate each card “I knew it” or “Still learning” and your ratings are saved automatically.

Ten idioms, ten short paraphrases. Match under the weather to “feeling slightly sick,” caught red-handed to “caught in the act,” and so on — the meaning stripped of its picture, so you have to know it, not just guess it from context.

A mix of multiple choice and fill-in-the-blank, with an explanation after every answer, right or wrong. Your best score is saved automatically.

Idioms started as literal pictures — someone really did break the ice on a frozen river to let ships through. Picturing the literal scene (a ball actually in your court, a bullet actually dodged) makes the figurative meaning much easier to remember than memorizing a definition alone.

Not every idiom belongs in every conversation. Hit the road and when pigs fly are casual and spoken; give the benefit of the doubt and leave no stone unturned sound fine in writing too. Each flashcard’s usage note tells you which is which.

You can’t build on the fence from fence the way you can build worker from work. Idioms are fixed units — change one word (“on the wall” instead of “on the fence”) and native speakers won’t recognize the phrase at all.

After you finish the flashcard deck, it automatically rebuilds itself from just the words marked “still learning.” A short second pass on the hard ones is worth more than repeating the whole deck.

Idioms stick fastest when you actually say them. Try dropping one — hang in there, cut corners, break the ice — into a real conversation or message before you move on to the next module.