by heart

IPA(Pronunciation)

Prepositional phrase

idiomatic

(idiomatic) From unaided memory and in full detail.

Japanese Meaning

丸暗記で / 暗記して、詳細な内容まで正確に覚えている状態 / 記憶だけで、順序や細部を正確に再現できる状態

She learned the entire poem by heart in just two days.

彼女はその詩をわずか二日で完全に暗記した。

Sense（1）

(idiomatic) From unaided memory and in full detail.

He used to live in that town, and he still knows all the streets by heart.