Japanese idioms are easier to retain when you connect them to usage and review them repeatedly, instead of trying to memorize too many at once.
Start with common idioms that create a clear image
Your first batch should be practical and high frequency. Expressions that instantly feel useful in conversation are easier to keep.
Idioms such as “目から鱗が落ちる” or “腹を割る” tend to stick because they already carry a vivid image.
Learn the idiom together with one example
Meaning alone is often not enough. Pairing the idiom with a short sentence helps you remember how it is actually used.
A simple order works well: read the idiom, read the Japanese example, then check the translation.
Use spaced review instead of heavy one-time memorization
Reviewing 10 idioms across several days is usually more effective than cramming 20 in one sitting.
Separating new study from review makes the learning process easier to continue.