







know by heart
know inside out
mastered
I knew all the songs by heart.
I assume he knows what he's talking about.

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Open the tool →烂熟于心 (làn shú yú xīn) means “know by heart, know inside out, mastered”.
烂熟于心 is pronounced làn shú yú xīn in Mandarin Chinese.
“know by heart” is 烂熟于心 (làn shú yú xīn) in Chinese.
This page has 2 example sentences using 烂熟于心, each with pinyin and an English translation.