Correct

老底儿

/ lǎo der /
Strokes

Example

As a Noun

sb's past; sb's unsavoury background

1
Jiē
lǎoder  
老底儿

expose/reveal sb's ignominious past; drag the skeleton out of sb's closet; dredge up some embarrassing facts about sb's past

2
lǎoderdǒu
老底儿
louchū
抖搂
lái  
出来

reveal the inside story; disclose sb's unsavoury past

As a Noun

family background

3
Zuǒlínyòushě
左邻右舍
dōu
qīngchu
清楚
men
他们
de
lǎoder  
老底儿
  

The neighbours all know their family backgrounds.

As a Noun

ancestral estate

4
Zhè
zuò
zháiyuàn
宅院
shì
jiā
他家
jǐn
yǒu
de
lǎoder  
老底儿
  

This house is the only property that has descended from his ancestors.

5
lǎoderquán
老底儿
bài
guāng
  

squander what one inherited