你出生的那一天
核心本身：一個人出生那天，每年同一日期回來一次。
birthday · noun · A1
The day each year that is the same date as the day you were born.
生日
核心畫面
Birthday is built straight out of birth + day — the day you came into the world, coming round again each year on the same date. Hold that picture: a yearly marker that points back to a beginning. From a person's own beginning, the same idea stretches to the 'birth' of a club or an event, and even jokes its way into 'birthday suit.'
birthday 就是 birth（出生）＋ day（日子）拼起來——你來到世上的那一天，每年同一個日期又繞回來一次…更多收起
birthday 就是 birth（出生）＋ day（日子）拼起來——你來到世上的那一天，每年同一個日期又繞回來一次。記住這個畫面：一個每年一到的記號，回頭指向某個『開始』。從一個人自己的起點，同樣的想法延伸到社團、活動的『誕生』，甚至俏皮地鑽進了 birthday suit（光溜溜）這個說法裡。Three branches
團體或大事的週年
把『人出生的那天』搬到團體和事件上：一個社團、公司、或一件大事也有它『誕生』的日子，每滿一年就是它的 birthday——等於把人的生日借給了組織。
anniversary (founding) · noun · A1
A day that is an exact number of years after a group, club, or important event first started.
週年、成立紀念日
生日裝＝光著身子
走的是俏皮的玩笑路：你剛出生那天身上一絲不掛，所以把『沒穿衣服』說成穿著『出生時的那套裝』——birthday suit。
in your birthday suit · noun · A1
Used in the joking phrase 'in your birthday suit' to mean not wearing any clothes.
（光著身子的）生日裝
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
birthdaynoun/ˈbɜːθ.deɪ/
- 1
The anniversary of the day on which someone is born.
- When's your birthday? Mine's on April 1.
- I'll be thirty-seven (years old) next birthday.
- 2
The anniversary of the day on which something is created.
- 3
The date on which someone is born or something is created, more commonly called birthdate or date of birth.
- 4
A birthday party.
- I'd like to invite you all to my birthday.
birthdayverb/ˈbɜːθ.deɪ/
- 1
informalTo celebrate one's birthday.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。