烂熟于心

爛熟於心

lànshúyúxīn

idiom

Meanings

1 to know by heart
2 to have thoroughly memorized
3 to know inside out

Characters

thoroughly, rotten

cooked, familiar

Examples

这首诗他已经烂熟于心，可以倒背如流。

Zhè shǒu shī tā yǐjīng làn shú yú xīn, kěyǐ dào bèi rú liú.

He knows this poem by heart and can recite it backwards.

公司的规章制度，每个员工都要烂熟于心。

Gōngsī de guīzhāng zhìdù, měi gè yuángōng dōu yào làn shú yú xīn.

Every employee must know the company's rules and regulations by heart.

Tips

memory

烂熟 literally means 'cooked to mush' — so thoroughly cooked it falls apart. Applied to memory, it means you've processed the material so completely it's part of you.

Stroke Order

烂 làn

熟 shú

于 yú

心 xīn