Correct

问底细

/ wèn dǐ xì /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/问底细-Chinese-idioms-Cchatty-8839ff78-bb16-4622-b98f-0f760eb132ed-1612778354.jpg

Collocation

1
问明底细
2
问清底细
3
凡事都要问底细
4
问……的底细
5
盘问问底细
6
查问问底细

Definition

问底细:

Literally means:

ask about the ins and outs

Actually means:

ask about the root of a matter

底细 refers to the ins and outs or the root of some thing.

This phrase means finding out the detailed information about a person, or figuring out the cause and effect of a certain matter.

底细,详细的根底或内情。

问底细,指弄清楚某人的来历、根底,或某事的前因后果等详细的情况。

Example

Used as predicate or object, and it can have other words in between. (作谓语、宾语,中间可插入其他词语)
1
shì
de
péngyou
朋友
  
,
duì
zhīgēnzhīde
知根知底
  
,
yào
wèn
de
底细
  
,
jiù
wèn
hǎo
le
  

He is my friend, I know the root of him, you have to ask him the bottom, ask me well.

2
Chū
出于
zhí
职业
guàn
习惯
  
,
fánshì
凡事
dōu
yào
wèn
底细
  
,
rèn
任何
jié
细节
dōu
huì
不会
fàngguò
放过
  

Out of professional habits, he has to ask the bottom of everything, any details will not be let go.

3
xiǎng
jiā
加入
zhège
这个
shètuán
社团
fǎnduì
反对
  
,
dàn
zài
jiā
加入
zhīqián
之前
dìng
一定
yào
wèn
qīng
清底
  

I have no objection to you joining this association, but be sure to ask the bottom line before you join.