Correct

半大不小

/ bàn dà bù xiǎo /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/半大不小-Chinese-idioms-Cchatty-e1552216-ec0f-409a-8499-0924a377745a-1612776568.jpg

Collocation

1
半大不小的孩子
2
半大不小的事故
3
半大不小的事
4
半大不小的 工作
5
半大不小的公司

Definition

半大不小

Literally means:

age between adulthood and childhood

Actually means:

It means the size of something is between big and small. It usually refers to the adolescent age. It also refers to intermediate degree of scale, size, weight, extent or significance.

处在大与小之间。通常指大于儿童但尚未成年的那段年龄。也指规模、尺寸、重量、幅度或重要性等不大不小。

Example

Used as attributive. (常作定语)
1
Liǎng
shēng
医生
gěi
le
wánquán
完全
tóng
不同
de
jiěshì
解释
  
,
zhège
这个
bàn
xiǎo
大不小
de
niánqīngrén
年轻人
zhīdào
知道
gāi
xiāngxìn
相信
shuí
  
?

The two doctors gave a completely different explanation, and the half-young man didn't know who to trust.

2
Huìhòu
会后
chǎngzhǎng
厂长
děng
shí
十几
wèi
lǐngdǎo
领导
  
,
hái
zài
jiā
bàn
xiǎo
de
fàndiàn
饭店
wéi
shèyàn
设宴
sòngxíng
送行
  

After the meeting, the factory director and more than a dozen other leaders, but also in a half-sized hotel for him to set up a banquet.

3
Zài
zhège
这个
bàn
xiǎo
大不小
de
chéng
城里
  
,
jiǔ
酒吧
shì
ting
打听
xiāoxi
消息
zuì
hǎo
de
fāng
地方
  
Zhǐyào
只要
qǐng
rén
bēi
  
,
shénme
什么
shìqing
事情
dōu
yǒurén
有人
gào
告诉
  

In this half-town, bars are the best place to find out. As long as you invite someone to have a drink, you'll be told everything.