Correct

打定主意

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Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/打定主意-Chinese-idioms-Cchatty-72e1ab3a-b926-40fe-8892-22bc41004885-1612777140.jpg

Collocation

1
让……(快)打定主意
2
打定主意……
3
没有打定主意
4
已经打定主意

Definition

打定主意

Literally means:

make up one's mind

Actually means:

It means making the final decision and won't alter. It is generally used on informal occasions.

做出了最后的决定,不再改变。多用于非正式的场合。

Example

Used as predicate, and Often used in sentences with verbal constructions in series. It can be used with other words in between. (作谓语,常用在连动句中,中间可以插入别的词语)
1
de
huà
zhǐshì
只是
suíbiàn
随便
shuōshuo
说说
de
  
,
shí
其实
shì
shì
zhí
辞职
hái
méiyǒu
没有
dìng
打定
zhǔyi
主意
  

Her words were just casual, but she didn't quit her job and she hasn't made up her mind yet.

2
guǎn
不管
父母
tóng
同意
tóng
同意
  
,
jīng
已经
dìng
le
zhǔyi
主意
yào
xiǎoqín
小琴
wéi
妻子
  

Whether his parents agree or disagree, he has made up his mind to marry Xiaoqin as his wife.

3
Háiyǒu
还有
liǎng
tiān
men
我们
jiùyào
就要
yúnnán
云南
le
  
,
dào
到底
  
,
ràng
kuài
diǎnr  
点儿
dìng
打定
zhǔyi
主意
  

We're going to Yunnan in two days.