Correct

老大不小

/ lǎo dà bù xiǎo /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/老大不小-Chinese-idioms-Cchatty-f8c2796d-6cef-4132-a2f5-82d0432731a1-1612777967.jpg

Collocation

1
老大不小的人了
2
早就是老大不小的了
3
老大不小了

Definition

老大不小

Literally means:

old enough

Actually means:

It means that one has grown up, approaching or already reaching adulthood. It is often used by one's seniors as an admonition to the junior.

指人已经长大了,接近或达到成年人的年龄。多用于长辈提醒晚辈说话做事要有成年人的样子。

Example

Used as predicate or attributive. (作谓语、定语)
1
lǎoxiǎo
老大不小
le
  
,
gāi
tánliànài
谈恋爱
jiéhūn
结婚
chéngjiā
成家
le
  

You are not small, it is time to fall in love and get married and become a family.

2
dōu
lǎoxiǎo
老大不小
le
  
,
自己
yǒu
gōngzuò
工作
le
  
,
hái
xiàng
父母
yào
qián
  
,
zhè
shuō
de
guò
过去
ma
  
?

He is not small, he also has a job, but also to parents to ask for money, this is the right thing to say?

3
zǎo
jiù
shì
lǎoxiǎo
老大不小
de
rén
le
  
,
hái
zhěngtiān
整天
gēn
xiǎoháizi
小孩子
nàonào
打打闹闹
  
,
xiàng
ren
大人
  

She has long been a big man, but also all day with children to fight, not like adults.