Definition of Happy Birthday to You from the Oxford Advanced Learner's Dictionary

 

Happy Birthday to You

 
BrE
 
; NAmE
 
 
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a simple song which is traditionally sung for somebody on their birthday, especially before they blow out the candles on their birthday cake. If the person's name is Peter, the song goes:
Happy Birthday to you.Happy Birthday to you.Happy Birthday, dear Peter,Happy Birthday to you!