Usage note
弟弟指家里比自己小的男孩子，用来称呼或介绍他。
dìdi zhǐ jiālǐ bǐ zìjǐ xiǎo de nán háizi, yòng lái chēnghu huò jièshào tā.
This word means a younger boy in the family, used to call or talk about him.
Context note
“弟弟”用来称呼家里比自己小的男孩子，是家庭称呼里很常用的词。
“dìdi” yòng lái chēnghu jiālǐ bǐ zìjǐ xiǎo de nán háizi, shì jiātíng chēnghu lǐ hěn chángyòng de cí.
This word is used to refer to a boy in the family who is younger than you. It is a very common term in family relationships.
5 examples
我是哥哥，他是弟弟。
wǒ shì gēge, tā shì dìdi.
I am the older brother, he is the younger brother.
弟弟喜欢吃冰淇淋。
dì di xǐ huān chī lěng bīng.
The younger brother likes to eat ice cream.
妈妈经常给弟弟讲故事。
mā ma jiāng cái gěi dìdi sòng kē jì.
Mom often tells stories to the younger brother.
我们家有两个弟弟。
wǒ men jiā yǒu liǎng gè dì di.
We have two younger brothers in our family.
弟弟生病了，需要去看医生。
dìdi shēng bìng le, xū yào qù kàn yīshēng.
The younger brother is sick and needs to see a doctor.
5 mini stories
弟弟喜欢吃水果。他最喜欢吃苹果。
dì di xǐ huān chī shuǐ guǒ. tā zuì xǐ huān chī píng guǒ.
The younger brother likes to eat fruits. He likes apples the most.
弟弟和哥哥一起玩。他们很开心。
dì di hé gē ge yīqǐ wán. tā men hěn kāi xīn.
The younger brother plays with his older brother. They are very happy.
弟弟学习很努力。他想成为医生。
dì di xuéxí hěn nǔ lì. tā xiǎng chéng wéi yīshēng.
The younger brother studies very hard. He wants to become a doctor.
弟弟喜欢画画。他画了很多美丽的图画。
dì di xǐ huān huà huà. tā huà le hěn duō měi lì de tú huà.
The younger brother likes to draw. He has drawn many beautiful pictures.
弟弟和家人一起去公园。他们玩得很开心。
dì di hé jiā rén yīqǐ qù gōngyuán. tā men wán de hěn kāi xīn.
The younger brother goes to the park with his family. They have a lot of fun.
Mini dialogue
我的弟弟
A
这是谁？
Zhè shì shéi?
Who is this?
B
这是我的弟弟，他五岁了。
Zhè shì wǒ de dìdi, tā wǔ suì le.
This is my younger brother, he is five years old.
和弟弟玩
A
你在做什么？
Nǐ zài zuò shénme?
What are you doing?
B
我在和弟弟一起玩积木。
Wǒ zài hé dìdi yīqǐ wán jīmù.
I am playing with blocks with my younger brother.
Related words and contrasts
opposite
哥哥
gēge
older brother
Older brother vs. younger brother.
contrast
妹妹
mèimei
younger sister
Younger sister vs. younger brother.