"Four-letter idioms" often appear in books, newspapers, and everyday conversations.
There are various meanings in the four kanji characters.

This app contains a total of 137 four-letter idioms by theme, such as personality, determination, effort, behavior, and human relationships.
It is a popular app that has been featured on TV.
Please use it as an app to check and improve your education!

This application "Four-letter idiom quiz Hanpuku general knowledge series" is free.
You can use all four-letter idiom quizzes for free.
Receive delivery from ad networks and display ads in the app.

This application "Four-character idiom quiz Hanpuku general knowledge series" is an application of the popular learning application "Hanpuku series" with a total of 30 million downloads such as "Kotowa quiz".
"Hanpuku" is a registered trademark of Gakko Net Co., Ltd.