Usage note
妹妹指家里比自己小的女孩子，用来称呼或介绍她。
mèimei zhǐ jiālǐ bǐ zìjǐ xiǎo de nǚ háizi, yòng lái chēnghu huò jièshào tā.
This word means a younger sister in the family. It is used to call or introduce her.
Context note
这个词用来称呼比自己年纪小的女性手足，属于家庭话题。
Zhège cí yòng lái chēnghu bǐ zìjǐ niánjì xiǎo de nǚxìng shǒuzú, shǔyú jiātíng huàtí.
This word is used to address a female sibling who is younger than you, and it belongs to the topic of family.
5 examples
这是我的妹妹。
zhè shì wǒ de mèi mei。
This is my younger sister.
我有一个可爱的妹妹。
wǒ yǒu yí gè kě ài de mèi mei。
I have a lovely younger sister.
妈妈带我去见她的妹妹。
mā ma dài wǒ qù jiàn tā de mèi mei。
Mom took me to meet her younger sister.
我的妹妹喜欢画画。
wǒ de mèi mei xǐ huan huà huà。
My younger sister likes drawing.
我们一起去公园玩吧，妹妹。
wǒ men yì qǐ qù gōng yuán wán ba， mèi mei。
Let's go play in the park, little sister.
5 mini stories
妈妈带我去见她的妹妹。妹妹很可爱。
mā ma dài wǒ qù jiàn tā de mèi mei。 mèi mei hěn kě ài。
Mom took me to meet her younger sister. She is very cute.
我有一个可爱的妹妹。她喜欢画画。
wǒ yǒu yí gè kě ài de mèi mei。 tā xǐ huan huà huà。
I have a lovely younger sister. She likes drawing.
妈妈带我去见她的妹妹。妹妹很可爱。
mā ma dài wǒ qù jiàn tā de mèi mei。 mèi mei hěn kě ài。
Mom took me to meet her younger sister. She is very cute.
我们一起去公园玩吧，妹妹。妹妹很高兴。
wǒ men yì qǐ qù gōng yuán wán ba， mèi mei。 mèi mei hěn gāo xìng。
Let's go play in the park, little sister. She is very happy.
我的妹妹喜欢画画。她画的很好看。
wǒ de mèi mei xǐ huan huà huà。 tā huà de hěn hǎo kàn。
My younger sister likes drawing. Her drawings are very beautiful.
Mini dialogue
这是我的妹妹
A
这是谁？
Zhè shì shéi?
Who is this?
B
这是我的妹妹。
Zhè shì wǒ de mèimei.
This is my younger sister.
妹妹在画画
A
妹妹在做什么？
Mèimei zài zuò shénme?
What is younger sister doing?
B
妹妹在画画。
Mèimei zài huà huà.
Younger sister is drawing.
Related words and contrasts
opposite
姐姐
jiě jie
older sister
妹妹 is younger sister, 姐姐 is older sister.
related
弟弟
dì di
younger brother
Sibling term for a younger male.
related
哥哥
gē ge
older brother
Sibling term for an older male.