A polite expression used to congratulate someone on their birthday ("Happy Birthday").
誕生日おめでとうございます。良い一年になりますように。
Happy birthday. I hope you have a great year.
朝、出社したら上司に『誕生日おめでとうございます』と言った。
When I arrived at work in the morning I said, 'Happy birthday' to my boss.
手紙の最後に『誕生日おめでとうございます』と書いてポストに入れた。
I wrote 'Happy Birthday' at the end of the letter and put it in the mailbox.