Correct

滚瓜烂熟

/ gǔn guā lànshú / 
Strokes

Definition

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

Example

Definition

recite fluently; rattle off

1
Tā
她
bǎ
把
xué
学
guò
过
de
的
shī
诗
bēi
背
de
得
gǔnguālànshú
滚瓜烂熟
  
。

She rattled off the poems she had learnt.