Breakdown of (o)tanjoubi
sun; day
日
birth
誕
Word got out you gave birth just to prolong your genes.
life
生
Your life depends on one cow, who gives you milk every day. Better take good care of it!
おo
honorific prefix
Usages of (o)tanjoubi
私 の 誕生日 は 三月 二十八日 です。watashi no tanjoubi wa sangatsu nijuuhachinichi desu.
My birthday is March 28th.
お誕生日 は いつ です か。otanjoubi wa itsu desu ka.
When is your birthday?
カレンダー に 誕生日 を マークしました。karendaa ni tanjoubi o maakushimashita.
I marked the birthday on the calendar.
必ず 誕生日 を 覚えて います。kanarazu tanjoubi o oboete imasu.
(He) always remembers the birthday without fail.
毎年、 誕生日 に ケーキ を 作ります。maitoshi, tanjoubi ni keeki o tsukurimasu.
I make a cake every year for my birthday.
誕生日 おめでとう！tanjoubi omedetou!
Happy birthday!
友達 の 誕生日 を お祝いしました。tomodachi no tanjoubi o oiwaishimashita.
We celebrated my friend's birthday.
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