Correct

摸底细

/ mō dǐ xì / 
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/摸底细-Chinese-idioms-Cchatty-0ac58080-e8a3-4551-9478-7adb5985e194-1612777372.jpg

Collocation

1
没有摸清底细
2
摸了底细
3
摸过底细
4
摸一摸底细
5
摸摸底细
6
摸清底细

Definition

摸底细

Literally means:

know the real situation

Actually means:

trace the origin

It refers to tracing the origin of a person or thing to understand the real situation. Usually such things are done in secret.

查明人或事物的根源或来历,弄清真实情况,以便做到知根知底,了解内情。这类事情多数在暗中进行。

Example

Used as predicate or attributive. It can be used with other words in between. (作谓语、定语,中间多插入别的词语)
1
Zhège
这个
rén
人
hǎoxiàng
好像
láilìbùmíng
来历不明
  
,
nǐmen
你们
yào
要
gǎnkuài
赶快
mōqīng
摸清
tā
他
de
的
dǐxì
底细
  
,
zài
在
zhè
这
zhīqián
之前
  
,
bùyào
不要
qīngyì
轻易
dòngshǒu
动手
  
。

This person seems to have an unknown origin, you have to quickly find out his bottom, before this, do not easily do.

2
Duì
对
zhè
这
jiàn
件
shì
事
nǐmen
你们
bù
不
néng
能
bù
不
mōqīng
摸清
dǐxì
底细
jiù
就
biǎotài
表态
  
,
háishi
还是
děngděng
等等
zàishuō
再说
bā
吧
  
。

You can't take a stand on this matter without touching the bottom line, or wait and say it.

3
Tāmen
他们
zhījiān
之间
de
的
máodùn
矛盾
wǒ
我
yī
一
diǎn
点
yě
也
mō
摸
bù
不
qīng
清
dǐxì
底细
  
,
hěn
很
nán
难
cānjiā
参加
nǐmen
你们
de
的
tiáojiě
调解
gōngzuò
工作
  
。

The contradiction between them is not at all clear to me, it is difficult to participate in your mediation work.