1
on one's birthday
表示在生日当天，用介词on。
I will see you on my birthday.
我生日那天见。
生日
先理解核心含义，再看它在真实句子里的用法。
生日
the anniversary of the day on which a person was born; the celebration of that day
I will see you on my birthday.
我生日那天见。
某人出生的周年纪念日
The anniversary of the day on which someone is born.
生日(出生纪念日或其庆祝活动)
an anniversary of the day on which a person was born (or the celebration of it)
某物创建的周年纪念日
The anniversary of the day on which something is created.
出生日期
the date on which a person was born
My birthday falls on a Monday this year, so I will celebrate it next weekend.
我今年的生日恰好是星期一，所以我打算下个周末庆祝。
They surprised me with a cake at my birthday party last night.
昨晚他们在我的生日派对上用蛋糕给了我一个惊喜。
Have you bought a birthday present for your brother yet?
你给你弟弟买生日礼物了吗？
表示在生日当天，用介词on。
I will see you on my birthday.
我生日那天见。
固定祝福用语。
Happy birthday to you!
祝你生日快乐！
celebrate后直接接birthday。
She celebrates her birthday with friends.
她和朋友一起庆祝生日。
Not this
I birthday today.
Use this
It's my birthday today.
生日是名词，不能用作动词。中文的‘我今天生日’直译会导致错误，英语中须用‘It is my birthday’或‘Today is my birthday’表达。
Not this
Happy birthday you!
Use this
Happy birthday to you!
‘Happy birthday’后需要加介词‘to’引出祝福对象，中文‘生日快乐你’的直译缺少‘to’，英语中这个介词不可省略。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
生日派对
We are planning a surprise birthday party for her.
我们正在为她策划一个惊喜生日派对。
生日蛋糕
She blew out the candles on her birthday cake.
她吹灭了生日蛋糕上的蜡烛。
生日礼物
I bought a nice birthday present for my brother.
我给弟弟买了一份不错的生日礼物。
生日贺卡
He sent me a beautiful birthday card with a handwritten message.
他寄给我一张漂亮的生日贺卡，上面有手写的祝福语。
生日快乐
Everyone sang 'Happy Birthday' to the guest of honor.
大家向主宾唱了《生日快乐歌》。
生日愿望
Make a wish on your birthday and it might come true.
在生日那天许个愿，它可能会实现。
（幽默）一丝不挂；裸体
He was caught in his birthday suit when the delivery man arrived.
快递员到的时候，他正好一丝不挂。
寿星（指过生日的男性）
Make a wish, birthday boy!
许个愿吧，寿星！
寿星（指过生日的女性）
The birthday girl blew out all the candles on her cake.
寿星吹灭了蛋糕上所有的蜡烛。
你说这是你的生日，也是我的生日，耶
From the song 'Birthday' by The Beatles, often sung at parties.
来自披头士乐队的歌曲《生日》，常在派对中唱起。
生日快乐，总统先生
Marilyn Monroe's iconic performance singing to President John F. Kennedy in 1962.
1962年玛丽莲·梦露为约翰·F·肯尼迪总统献唱的经典表演。
发长 /eɪ/ 音 (如 day, play)
Use birthday naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把“birth”联想为“出生”，“day”是“日子”，合起来就是“出生的日子”，即生日。
register: neutral, contexts: ["birthday celebration", "personal event", "social occasion"], note_zh: "“birthday”为中性词，适用于各种正式与非正式场合，通常作为日常交流中的常见话题。"
All listed words share the same final syllable /deɪ/ and fully rhyme with 'birthday'.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.