滚瓜烂熟

Traditional (Taiwan): 滾瓜爛熟

gǔnguālànshú ㄍㄨㄣˇ ㄍㄨㄚ ㄌㄢˋ ㄕㄨˊ

    • lit. ripe as a melon that rolls from its vine (idiom) fig. to know fluently
    • to know sth inside out
    • to know sth by heart

Character by character

Sources